Hf tube amplifier

hf tube amplifier HF-Amplifier with 4CX1000A . Do not learn to depend on the protection circuitry built into the amplifier for everyday use. 2) The 3CX1500/8877 tube is designed forRF poweramplifier applications, and is not inexpensive. RF Power Products (RFPP) Hercules 15013 RF Generator. FU728F Tube. These relics were made on the 1960's and early 1970's and were popular with truck drivers for CB as well as  PA LINKS to sites which show examples of amplifiers presented on the internet elsewhere. The PA150 is a 200 Watts SSB/CW rugged HF Linear amplifier units that will give many years of hard working service latest and smallest amplifier. A. 41-46. Sales price $299. com/find/eesof-how-to-pa-basics To apply for free trial of ADS visit: http The input circuit should never be a large fraction of the wavelength away from the cathode at harmonics of the highest operating band. These high frequency models offered in this eBay collection are contained between very high frequency (VHF) and mid-high frequency (MHF). Looking to revitalize your amp? We maintain an extensive list of amplfiers and their required components - browse to your amp manufacturer below and select your amplifier to see a listing of the components which you can replace in your amp - we will show you all of the components which are interchangeable so that you can select the one that works best for you. IMAGING · Neutron Imaging Facility. 95 Out of Stock : No Image Available: AL80BNT : AMERITRON AL80BNT: 1kW HF AMPLIFIER without 3-500ZG TUBE, 110Vac US $1,471. 31. 2 Treble Bass Adjustment(6J4-Silver) 4. With about 5 W input the amplifier provides an RF output of about 80 W on 28 In contrast with American sweep tubes they will even function well with anode is expired (in NL) and a lot of former UHF/VHF amateurs moves to the HF bands. You should enjoy years of trouble free service at a reasonable cost. AMERITRON mounts the 572B tubes vertically, not horizontally, to prevent hot tube elements from sagging and shorting out. HF 813 Linear Amplifier I’ve always wanted to build a massive linear amplifier since I was at school. Sep 15, 2017 · The first step in troubleshooting any tube amplifier is to determine if the power tubes have gone bad. The EICO Model HF-81 is a complete high fidelity stereophonic control center and a pair of 14 watt amplifiers; all on one chassis. 3 1)This amplifier retails new (lowest price) for ~$3,230, from several Amateur retailers. C $26. The HF-300 has found favor with many broadcasters and  /psu. 22 Jan 2020 Anyone who knows me knows I love Acom amplifiers with a passion. 23 shipping. With its very modest price tag, this kit is an affordable step into the wonderful world of vacuum tube audio. So far received 1 votes Dimensions, including amplifier, power supply, tuner and controller, are only 350(H) x 269(W) x 378(D)mm* And, because the controller is detachable, the IC-PW1 can be installed almost anywhere in your shack. Antennas, Band Pass Filters, Low Noise Yagi, Preamplifiers, Splitters Antennas Amplifiers is celebrating our 30th anniversary. HF Linear Amplifiers. "If you purchase multiple items, i ask you to request the total amount / invoice,so that we can provide the shipping discount" TUBE AMP / AMPLIFIER / CHASSIS Circa likely 19 50's SOLD 2/21/13 SHIPPING TO CALIFORNIA Unknown Mono-Block tube amplifier. The OM4000A is a memorized tuning settings HF amplifier. We aim to be the place you look to first for all your ham radio amplifier needs! AIYIMA 6J4 Tube Amp Amplificador, TPA3116D2 Power Digital Home Audio Amplifiers 50Wx2 HiFi Stereo Vacuum Tube Amplifier with Bluetooth 4. 8 through 30MHz, has automatic self-tune capability, and provides up to 1500W output power with less than 60W exciter drive. Though the transmitter was mostly my  Eico HF20. AMERITRON AL-80B Linear Amplifier Single 3-500Z HF 1000 Watts PEP 110 or 220 Volts. Automatic antenna tuner built-in HF AMPLIFIER. 5Kfx was the flagship of the Tokyo Hy-Power line of HF amplifiers. 00 plus shipping from Bryan, OH, which was about $65. Bought before on ebay never used. TOF Amplifier Tuning Aid. 25" x 8. Many hams like the challenging of hunting for parts to build a high quality amplifier out of inexpensive   How to select a tube HF amplifier ? (I). Fully automated work with the ACOM 04AT antenna tuner. Feb 18, 2016 · the hf-2000 1. Jan 23, 2019 · What is the best cheap HF amp that does not need service? I believe a used Ameritron AL-811 with three 572B tubes is a great bargain. 2. C $1,172. Jan 01, 2012 · While there may be exceptions, neutralization of a high frequency PA (power amplifier) vacuum tube amplifier has little to do with VHF or UHF stability. AL-811HD gives you 800 Watts output in SSB and 600 Watts for continuous duty in CW, RTTY, SSTVand AM operation. Its design is based on the venerable 6BQ5/EL84 output tube, made famous by the British invasion and folks like George Harrison, who plugged his Gretsch Country Gentleman guitar into a Vox AC-30 amp using four EL84s. Tube Amplifiers Solid-State Amplifiers  Power valves are capable of high frequency response, up to at least 30 MHz. Hunter 2000C Linear HF Amplifier 80-10 Meters *NICE* C $893. The amp Looks and works great Price $575 AMERITRON AL-811 AMPLIFIER - $500 (Meridian) For sale is Ameritron AL-811 HF 600 watt amplifier. 5. The AL-811H is a grounded grid linear amplifier developed by Ameritron using low cost 811A power triodes. S. The next item to check, should the amplifier have one, is Jul 06, 2008 · GS-35B, GS35B, Russian Triode, Tube, Socket, Linear, Amp, Amplifier, Project, HF, VHF, UHF, w4zt, ham radio, amateur radio, uyless, uyless king, tony king, atlanta HARDROCK-50 HF Power Amp Kit. Buying an HF High Power Amplifier: -What to Used Amplifiers (Tube Types) - continued Multi-tube amps usually require matched tubes (RF Parts does this). Fast Warm Up Time: The 811A tubes take approximately 10 seconds to warm-up. EUR 547. now acquired by Palstar ACOM After the vacuum tube(s) the next most expensive component of a power amplifier is the high voltage (HV) power transformer. The auto-operate function (when enabled) maintains the Many amplifiers using two 3-500s use such small power supplies they dont deliver much more power output than the AL-80B. 86. Some can operate on 120 volts AC if you do not have a 240 volt outlet in your ham shack. com, mainly located in Asia. Learn about "pulse-rated" tubes, and what the difference is from standard tubes. High voltage DC flows out of the Rectifier Tube's cathode to a series of electrolytic Filter Capacitors (C3, C4 and C5) and Voltage Dropping resistors (R10 & R11). EL/PL 519 tubes are dedicated to TV purpose during the 70s , therefore this kind of tube are able to be used for HF. The 120V AC serves two transformers. or Sale. Buy It. For HF, you have the choice from color television sweep tubes like the PL519 (up to 150W PEP, < 30MHz), dedicated HF tubes like the QQE06/40 (up to 150W PEP, up to 70cm), or the 4CX250B (up to 250W CW, up to 70cm), just to name the most common ones. Keep in mind that the before 1982, the FCC regulated hams according to input power, so when hams talk about a 1kW amplifier, they are referring to 1kW input, not output. The tube in this amplifier is 100%. Generous power and great dynamics with the proven MRFE6VP61K25N by NXP. I like the 3-500 tube for ruggedness, availability, and affordability. Linear amplifiers are most often used in amateur radio, laboratory equipment, and audio equipment. Then I key up the radio (no modulation) and adjust the TUNE PLEASE DONATE TO SUPPORT THE CHANNEL - Visit: https://w4eey. 95 * Buy It GROUNDED GRID TRIODE HF LINEAR AMPLIFIER click on any photo to ENLARGE The 3CX3000F7 power grid triode with its 4000 watt plate dissipation loafs along at legal limit Amplitude Modulation, plus It only needs one D. We specialize in the repair of any ham tube type amplifier, from blown diodes to replacement band switches. Fashioned After EICO HF-60 Monobloc Amp. This model PA150 amplifier has outstanding performance in its class and represents truly exception value for money. The Tube amp Library of information Click the link above for Tube amp info, Schematics, Board building information, Projects, Mods, Transformer diagrams, Photo's, Sound clips. Ham radio power amplifiers category is a curation of 232 web resources on , How to select a tube HF amplifier, HL1INF RF Amplifiers, Pondering a QRO Amplifier?. The HF-300 has found favor  Vacuum Tube Mobile HF Linear Amplifiers. Unfortunately I do not have a receipt. html>over here</a>. This link is listed in our web site directory since Tuesday May 10 2011, and till today "How to select a tube HF amplifier" has been followed for a total of 653 times. Amplifier control is accomplished with only six buttons on the front panel or directly See full list on w8ji. Gippstech 2004. SCHEMATICS VARIUS SCHEMATICS DIAGRAM; VALVOLE TUBE DATA SHEET VALVOLE AMERICANE AND RUSSIAN TUBE DATA SHEET; 16 x MRF150 HF Solid State HF Amplifier with 16 MRF150 2. Building your own tube-type HF amplifier, doing it "The Right way". But I understand if it's not your cup-o-tea And I have other amps. HF Power Amplifier For YASEU FT-817 818 ICOM IC-703 Elecraft KX3 QRP Ham Radio. ▫ Solid  We added 3. Jan 06, 2015 · The linear amplifier OM4000 HF is designed for all short wave amateur bands from 1. 160 m to 10 m. In all quality tubes amplifiers (i. They can have either vacuum tubes or use solid state technology. There are hundreds of pages of Tube amp information on my library page. 75W on FM. 7 MHz (including WARC bands) and all modes. 100 watts of drive will yield legal limit. With the output and input in series, a grounded grid amplifier has large amounts of negative feedback. our unique blend of high quality, durability, and performance will make your operating time both exciting and enjoyable. Two (2) Eimac 3-500Z Zero Bias Triodes; Operated AB2 - Grounded Grid Service. After a bit of research and info from a customer, we installed 1x 5U4GB, 2x 12AX7 and 2x 6L6GC's. Technical review : how to select a solid-state HF amplifier ? Due to the higher voltage excursion, amplifiers powered between 40-50V DC (thus desktop models like Yaesu VL-1000 Quadra) exhibit also considerably better linearity, and thus lower IMD, than units powered on 13. 57 Another home-brew HF amp project, a single EIMAC 8877 in a re-worked Harris chassis. This is a single-stage preamp, Class A tube amplifier. Amplifiers with Tubes; HF-Amplifier with 4CX1000A. Sep 21, 2019 · Hf Tube Linear Amplifier. [ HA8UG] (HF, 6 & 2M, 70cM, 23cM) 6. The simplicity of the build is the point i was focusing. 600 watts HF amplifier, 10-160 metres, with 3 811 tubes AL-82 Amplifier The Ameritron AL-82 Linear Amplifier is designed to give you years of trouble free service at the full legal output power limit AMPEREX TUBE TYPE HF R. Perhaps the builder would like to build a mono-band amp first, to gain experience and confidence, before proceeding to a more complex multi-band design. 06 shipping. (Click on images to see full screen) Drake L-4B modified to a single 3CX1200A7, blower, and Peter Dahl tx. amplifiers category is a curation of 232 web resources on , TANKIT, SB220 SB221 arcing problems improvements mods, How to select a tube HF amplifier. 2,3, Same with vacume plate tuner and turns counter. Broadband, Ultra-linear, Extremely High Frequency (EHF) Traveling Wave Tube Amplifier. OM Power OM-2501A -MARS Heavy Duty Legal Limit HF Automatic Amplifier. Compact HF linear amplifier with more than 700W of output power on all amateur bands from 1. Tuning Steps. During a visit to an HAM exchange exhibition (Radiantistica Expo) I came up with the idea of building an amplifier using the mythical Russian tube Gi7b. 95 Special Order : AL811 : AMERITRON AL811: 600Watt LINEAR (3) 811A TUBES The HL-2. This small HV-supply is actually great for many medium power amplifier. It has a Make Offer - Xiegu XPA125B 100W HF Power Amplifier + Auto tuner ATU For X5105 X108G G1M G90 NEW - RCA 6166A 7007 Ceramic RF Beam Power Tube 12KW Radio Amplifier VHF HF ILS 6,405. This article covers commonly used vacuum tube amplifier configurations with is there to prevent high frequency oscillation (in spite being built for AF, this tube  Eico HF-86 Stereo Tube Amplifier 14 WPC. This negative feedback reduces distortion and stage gain. It has 572B tubes. My experience is that these European tubes appear to be much more robust in a HF amplifier than the American types. 5kW (1. com. 70. If there are multiple tubes with filament failures, substitute a new tube, one position at a time, as some amplifiers place multiple filaments in series, and a failure in one can cause filament outages in multiple. (50W). Dahl Co. These amps provide 700 W output power (PEP SSB or CW modes). This is an It is worth a few extra dollars for a 3-500Z based HF amplifier vs the 572B, 811A and sweep tube HF amplifiers in the long run. The main category is RF power amplifiers that is about Ham radio power amplifiers. I'm selling the amp for a widow of a SK. Please visit my Tube Amplifier Forum Here's the place you can go to ask tube amplifier questions. Get the best deals on Tube Amplifier when you shop the largest online selection at eBay. or sources for anything which might be useful in building high power amplifiers using Russian tubes. 18 What are the specs for high-frequency amplifiers? High-frequency amps are designed with multiple knobs that manage various sound-modification tasks. Testing a 833-A vacuum tube for first time in 50 years, out of box. HF-1000LP Series. Ω. If the use of russian tubes can decrease the price of your amplifier, technically speaking it is very hard to reduce the price of wires, coils and magnets, and therefore the power supply unit (PSU) remains the stumbling The Gemini HF-1K is a solid-state 1kW 1. No tubes are included. *After Coupons & Promotions. The one guitar amp design the book discusses is an odd one that mixes the clean signal with the distorted signal in parallel rather than running the input through all the tubes in series. November QST: HF Amplifiers versus Antennas—One Ham’s Opinion - Page 2 1. In the purchase of our amplifiers the following is included: Installation of the AC plug. The prefix "HPR" signified pre-amplifiers, and the prefix "HF" was for power amplifiers. Compared to the 2500 you can hardly hear the muffin fan in the 2000. The output signals are pre-emphasized to assist the model at learning the high-frequency content. A PL519 HF Power Amplifier The famous PL519, a sweep tube from 1970ies color TV sets, is shown below: In my humble opinion, building at least one tube amplifier in your life completes the spectrum of a ham radio operators competences. C $63. EUR 25. Audio Asylum - Amp/Preamp Asylum: REVIEW: EICO HF-85 Amplifier (Tube) by Richard CWY - Looking for a new Amp or Preamp? If you're after tubes, post /bbs. com The first night Balanced Audio Technology's VK-56SE tubed amplifier was in my system, I sat on the floor studying the unusual shape and dark orange glow of its four 6C33C-B output tubes. Based We sell NOS (New Old Stock) GU-74b or 4CX800 tubes used in the Acom 2000A, Acom 1000, Acom 1010. Most ham radio systems use linear amplifiers with vacuum tubes that can boost the RF transmission amplification by 10 to 20 times in the one to two kilowatt range. Finally, 100 W times 10 equals 1000 W, a 10-dB increase in power output. 8877 “Lite”–A 50-MHz 20-Pound Travel Amplifier b y Dick Hanson, K5AN January 2006 QEX pp. At left, inside this QRO HF-2500DX amplifier we recognize in the middle near the Svetlana 4CX800A/GU74B metal/ceramic tubes, the orange plate choke on which are grounded blue parasitic suppressors. TUBE COMPLIMENT. Resources listed under Amplifier category belongs to Technical Reference main collection, and get reviewed and rated by amateur radio operators. Reactor Overview · Reactor Core Assembly · Horizontal Beam Tubes · Downloadable Data. The EICO HF-81 is one of the all time best integrated tube amplifiers made, competing with far more costly amps! [email protected] Power Amplifier and Oscillator Class B Audio Amplifier or Modulator The HF-200 is another of the highly proficient high frequency generators of original Amperex design and development. Imagine that all your ham shack is invaded with rigs and accessories, that your antenna, beam, vertical or wire is  Unlike other ham radio related web sites, my site operates very differently. ) Linear (975,720 bytes, PDF file) Since the tube conducts heavily during negative cathode swings, that is also when the extra voltage provides the largest contribution to output power. Plate current, plate voltage, output power, reflected power, screen grid current, SWR, overdrive, ready, transmit and fault information, for short all parameters are displayed on this sophisticated solid state display panel utilizing colored LEDs. AL Warning: the information in this book is about tube amplifiers in general but the author seems to have more experience with Hi-fi amps than guitar amps. If you find it confusing and have suggestions to improve it, please email me at this address: ACOM 700S Solid State 1. The ACOM 1000 HF Linear Amplifier is the world's best value in an amateur HF amplifier. It is clean and a non-smoker home. Gi7b is tube designed for microwaves but working good as HF amplifier. Listed under the Technical Reference/Amplifiers/HF Amplifiers category that is about Amateur linear amplifiers. Long Tube Life: The 811A tubes are long life, reliable transmitting tubes. ACOM 1000 HF + 6 Meter Linear Amplifiers are the world's best value in an Amateur HF amplifier. A wide variety of hf tube amplifier options are available to you, such as ip54, ip55. ) Linear (975,720 bytes, PDF file) TUBE AMP / AMPLIFIER / CHASSIS Circa likely 19 50's SOLD 2/21/13 SHIPPING TO CALIFORNIA Unknown Mono-Block tube amplifier. General Description of OM2500 HF POWER AMPLIFIER Top view of the opened amplifier HF PART In this amplifier a tetrode GU 84b is used in a grounded-cathode circuit (input into control grid). Matching the actual antenna impedances to the optimum tubes load is completely automated. $80. A No-Bandswitch, Dual-Band VHF Desktop Amplifier QEX Jul/Aug 2000 Using a pair of 3CX800A7s, this 6- and 2-meter amplifier yields the legal-limit. Note: the kit includes a small ontainer of heat sink grease. The web site on which this is found is an excellent introduction to tube amplifiers: 400+ Watts: 41. Most tube amplifiers can easily handle a 2:1 SWR or higher without doing any damage to the tube(s) or the RF deck. Vintage Vacuum Tube Power Amplifier. The 570 was sold prior so I had no chance to test this unit. Nov 07, 2020 · Discover over 460 of our best selection of hf linear amplifier on AliExpress. Projects, Mods, Transformer diagrams, Photo's, Sound clips. Never think about an ATU for VSWR up to 3:1 (2:1 on 160 m). The amplifier has been tested, the lights work, but I do not have a  Introduction This guide is primarily written for those who are new to HF tube-type amps, or anyone who wishes to get the most out a Linear amplifier. AU $229. 22 Feb 2020 Contains a 'HF Vacuum Tube Amplifier Parasitic Oscillations' Fact-of-the-Day that was syndicated to other websites on February 22nd. How HFIR Works. 3 out of 5 stars 19 Currently unavailable. 46 postage. > A good many Pictured is my home brew amplifier that uses a single 3CX1000A7 tube in grounded grid. I would not own an AL-811 without the 572B tubes though. 0), 1, and 4. Мы занимаемся продажей радиоламп для Hi-Fi/Hi-End аудио аппаратуры. Jun 15, 2019 · yold You are strapped for cash, but want an HF amplifier. Don't let the inexpensive price tag fool you, as this tube amp can go head to head with amps that cost $800. I seen the AL-811 for around $450 used. Two tube 4-1000a amplifier part 1 Oct 13, 2019 · In my opinion either of these amplifiers will produce within 1 S unit of a legal limit output HF amp and the replacement tubes are not too expensive. Top of the rack is a small homebrew 4CX350A amp for 144 MHz, below that is my homebrew HF  2 Jul 2006 The EICO HF-81 is simply a fantastic-sounding amplifier that, bench with repair manuals (the 1956 TT4 RCA Transmitting Tube Manual, etc. It's really a cool-sounding amp. 0: 4-400A (or C) 44: The G2DAF Linear Amplifier: All HF bands. The final stage uses field effect (MOSFET) transistors type MRFE6VP61K25N, designed to withstand high mismatch (SWR) at the output and intended for operation in aerospace, industrial, mobile, and radio broadcast applications. Was: AU $241. Over time, you’ll also find amateur radio amplifiers for sale by major brands such as RM Italy, Ameritron, ACOM, or Alpha Linear Amplifiers from RF Concepts and others. 23 bids. My Russian neighbor told me they were used as regulator tubes in MiG jets during the Cold War. In most respects it is a typical grounded grid linear amplifier, with the exception ofRead More The OM4000A is a memorized tuning settings HF amplifier. 00 $800. I did this with the use of an MFJ antenna analyzer which I connected to the output Manufacturer of amplifiers, antenna switches antenna Tuners, wattmeters and relay buffers, amplifier accessories, antennas and tubes and parts Xforce Amplifiers Makers of the Xforce Amplifier Commander Amplifiers HF anf VHF amplifiers made in U. Jul 02, 2006 · The HF-81 has two push-pull Williamson amplifier circuits and a stereo control center on a single chassis. Full QSK-ready. 05-4G NF=0. Find many great new & used options and get the best deals for Vintage Eico HF-86 Stereo Tube Amplifier "Untested' Parts or Restore at the best online prices at eBay! Free shipping for many products! Tube amplifiers are a popular project among hams. 07. Hello everybody, this post is about my passion for DIY. 94. Of course is this not so much from this tube, but 2 GI-7b can use this supply. Also PA3BIY Preamp rebuilds for sale. We, now, proudly install Harbach Electronics amplifier kits and have been named as a recommended installer on their site (find link on our favorite links page). Vacuum tubes operate at high anode voltages and moderate anode currents; typically, a tube PA (power amplifier) stage requires an RF anode load resistance of approximately 2000Ω for optimum efficiency. Tuning a tube-type amplifier properly and why. The automatic tuning features in the ACOM 2000A represent a real breakthrough in HF amplifier design. Nov 08, 2020 · I purchased this amp from the family of a silent key. BoyuuRange MT-34 MKII EL34 Tube Hi-Fi Intergrated Amplifier Push-pull. Indeed, many of the Directly Heated Single Ended Triode (DH-SET) audio amplifiers  Eico HF 89 tube amplifier in very good conditionIt was serviced by the previous owner and weak performing parts replaced. e. Learn about vacuum power amplifier tubes. SSB (2 KW PEP Input); CW,   11 Sep 2020 After I completed the 6CL6 One Tube Transmitter, I decided that I wanted to build a matching amplifier. The 572B tubes cost about $200. The radio and transistor amp are setup for 100 watts output (dead key) which is what the tube amp requires. The Tube amp Library of information Click the link above for Tube amp info, Schematics, Board building information. The big filter caps are This was my very first HF amplifier build. Rm italy kl 35 kl35 amplifier linear hf / cb / 10m. My low voltage power supply runs 2800 volts key down. com in a single category. jpg. Some new replacement ceramic tubes can cost as much as these amplifiers. It uses a PAIR of dual-LDMOS BLF188XR power devices for reliability, and has full high speed QSK capability using a diode switching circuit. 26 Jul 2018 This works well on most HF amplifiers. Back in stock as of 3/10/2020. As someone who is new to tube technology this integrated amplifier was quite a surprise to my  ACOM 1000 HF Power Amplifier - 1000 Watts Continuous Carrier Regardless Of Mode. Free Eico HF-85 ECC83 / 12AX7 6X4 Tube Stereo Pre-Amplifier Preamp. The AL-811H is about $600+ used. It is equipped with a two pieces of ceramic tetrode FU728F. Results 1 - 26 of 26 GI-7B Lot of TWO (2) Russian NEW Tube power amplifier QRO HF VHF UHF GI7B. HRO Discount Price: $1,859. This amp was in-line with a Kenwood TS-570s. The distance traveled with radio equipment makes the HF amplifier suitable for aviation needs and live radio broadcasts. Tuning Pulser Systems. Continuous 2500 W output, no time limit. amplifier). The amplifier can tolerate loads up to 3:1 VSWR (2:1 Five inch (5”) (108x65mm) high resolution color display, 800x480 pixels and 24-bits colors. 8-54 MHz Linear Amplifiers are state-of-the art amplifiers that cover all amateur bands from 160 through 6 Meters. html Building the B26 RF-2K+ HF Amplifier from RF-Kit. Nov 10, 2019 · This inexpensive Tube Amplifier kit has been available for a number of years now and makes for a nice little tube amp. In the circuit at right, the 1 mH plate RF choke allows the direct current from the plate supply (B+) to pass through it, while preventing the RF on the ACOM A1010 HF Power Amplifier 160-10 700 Watt PEP - 500 Watt Continuous Carrier . Idea was to built cheap, reliable HF amplifier covering 160m. )  Linear amplifier for 20/15/10 mtr bands using QQe06/40 tubes. This probably relegates the safe distance to a few inches for an HF amplifier, although it is tube and operating class sensitive. In fact my old friend John Weston (G3LYW) gave me an 813 to use in an amp, I built up a power supply for it but never completed the linear so I’m going to have another shot at it! A wide variety of hf amplifier options are available to you, such as 2 (2. > A good many Amplifier Transformers: Magnetic Components, Inc. Make Offer - Lowest Price: Pair EICO HF-22 Tube MONO BLOCK Power Amplifiers, Vintage Tubes RARE EICO HF-20 6L6 Tube Integrated Amplifier Model 20 Serial # 36232 C $638. The 70cm PA - Conception. iconaudio. This should be used on Q2 and IC1 (the TO220 parts) to provide better cooling. 00 Save: 10% off. All irregularities should be noted. 65 sold  Vintage Inspired Classic Tube Amplifier Set. The plate transformer is 2 FEATURES. $1,800. This amplifier achieves excellent linearity by the voltage stabilization of the control grid bias and the screen voltage. . I noticed their brightly lit, cathedral-like innards. forced-air cooled tetrode intended for use in power amplifiers with distributed amplification and for 2 TUBE GU-84B HOMEBREW 8KW+ OUTPUT HF I5UXJ   The HF station, amplifier rack to the right The QBL 5-3500 tube. Homemade HF amplifier from officina IU2CKS. But than, you feed your good music source in the transistor amp, and in the old bad, nostalgic, archaic, inefficient, power consuming, ugly, tube amp, lets say a good japanese stereo 300B SE with a power output of 10W per channel, or a more powerful Macintosh 450, without ANY tone control, and play a Toccata, or some Bach, recorded from an OLD Home built HF Amplifier using two 4CX250B tubes. A warranty for two years on the amplifier and one year on the tubes. 3CX15000A7 HF LINEAR AMPLIFIER - 3 X QB4 HF PROLINEAR AMPLIFIER 8XQB4 HF LINEAR AMPLIFIER - 6XQB4 HF LINEAR AMPLIFIER 2X 4CX250 VHF LINEAR AMPLIFIER - 4CX350 VHF LINEAR AMPLIFIER: VHF-UHF-SHF Projects,PA3EXV Nice descriptions of Transverters, Amplifiers and Preamps for VHF-SHF. the linear amp has been started but is only. 0 out of 5 Low Noise LNA 0. VA7OJ. A look at what's inside FL-1000 ~ 2100Z Most amateur radio operators of the 21st century are well acquainted with the world renown FT-101 and the matching line of accessories including the FL-2100B compact 1200w PEP linear amplifier. Four 811A tubes have 260 watts plate dissipation and three 572B have 480 watts plate dissipation. Gain of a Grounded Grid Amplifier. Philips tube amplifier HF 10 Amplifier was upgraded for microphone by the previous owner. de Showing both the Assembly and A low cost 600 watt ultra-linear amplifier for 40, 20, 17, 15, 12, and 10m This compact little amplifier is the brain-child of Pat Murdoch, ZL1AXB, in Auckland, New Zealand. Customer Review Price: Low to High Price: High to Low ATX Walk About Portable QRP HF Antenna covers 2 to 80 Meters, Made to work with the Yaesu FT-817 The OM Power model OM4001A is an automatic power amplifier, designed for use on all short wave amateur bands from 1. 7 MHz - 1500 Watts minimum on all served bands - -30 dBc Read more → Vacuum Tube Amplifier Sets. Greetings: I'm selling a Heathkit SB-200 80-10 HF amplifier. DIY Kits 70W SSB Linear HF Power Amplifier for YAESU FT-817 KX3 Ham Radio Suitable for FT-817 KX3 Other Small Power Stations 2. There's hardly anything new to add about grounded-grid triode amplifiers. In The V3 Rectifier Tube transforms the 325v AC high voltage from the Power Transformer into 360 volts of high voltage DC which the amp needs to power the tubes. Since 1988 we have been manufacturing amateur radio antennas, preamplifiers and band-pass filters all of which have unparalleled performance and an excellent reputation for strength, reliability and longevity. More electron tubes can be found in the tube store collection of New Old Stock (NOS). Call-Sign QSK Option Description. 95 Special Order : AL80BQ : AMERITRON AL80BQ: HF AMP, 1kW 3-500Z with QSK-5PC INSTALLED 110Vac $1,893. RF Power Amplifier or Oscillator. Many hams like the challenging of hunting for parts to build a high quality amplifier out of inexpensive surplus parts. All amplifiers have a tuned input that is important for solid-state transceivers without an antenna tuner. More than 4000 W peak output. $900. FU728F Tube . This one came with the optional vacuum relay QSK T/R circuitry. Genuine 3-500ZG Tube The AL-80B uses a genuine 3-500ZG tube warranted by the manufacturer -- not cheaper, less reliable 3-500s used by some competitors. Ameritron s compact AL-800 / AL-800H amps are both desktop linears with plenty of muscle! At 14. 8MHz to 54MHz. FU728F Tube2500 W output automatic tuning HF amplifier. Tubes . Orders will ship within a week of ordering. 2007, P. The plate-load True Resistance Indicator (TRI) is a powerful tuning aid which helps the operator to quickly and precisely match antennas. VHF instability is almost always caused by a high impedance (or even parallel resonant) path from grid-to-ground. 1. of tube audio equipment new or vintage Welcome to NOS Valves Online! This is the place to bring your excellent vintage Scott, Eico, Fisher, Pilot, Harman-Kardon, and Dynaco tube amplifiers for the ultimate tune up, mod, or repair! About the HF amplifier RE-PA30HF5C (prototype) This project uses a widely available IRF510 MOSFET. 5 kilowatt desktop linear amplifier can put you in control. 8 till 29 MHz (including WARC) and all modes. From the highly respected UK outfit based in Leicester, this is one amp that most of the media has (criminally) ignored but is a great, small footprint (for the company, at any rate) valve-driven device that includes a headphone socket at the front with a neat, two-position, input selector and volume control. With it you can select pre amplify, and control accurately any stereophonic source (tape, discs, or broadcasts) and feed it through the self-contained dual 14 watt amplifiers to a stereo pair of speaker systems. Output power 350W/11kW in pulse. NEW GI-7BT. Unpack and remove each component carefully from its carton, preserving the factory packaging as much as possible. It's about the sound. Technical review : how to select an HF tubes amplifier ? At left, the Emtron DX-3 digital display. RM Italy HLA 150V Plus Professional Linear Amplifier With Fans. I am the original owner, and amp is like new. CLANK HF Linear amplifier with 2 3-500Z; Amp hf 3000 WattAmplificatore lineare hf con Parallelo di 2 4CX800; LA0BY Amplificatore lineare Vhf con Push pull 2 4CX250; SM5BSZ Building High Power Amplifiers page; How To Run Your (Tube Type - Ed. First, I turn on the filament voltage and let the tube amp warm up for at least 30 minutes so the filaments are at proper operating temp, and the cathodes are properly heated. Parts . 1kW HF AMP w/3-500ZG TUBE, 110Vac US $1,665. The GI7b was my choice of tube due to its proven abilities, low cost (some 15 Euro)  Products 1 - 28 of 28 Tube Amplifier Headphone : Welcome to Hifi-Amplifiers. Be prepared Tube Amplifier. It is a full legal limit amplifier with a minimum output of 1. Arcing in amplifiers . gi7b is tube designed for microwaves but working good as hf amplifier idea is to build cheap reliable hf amplifier covering 160 meters band . He was a CW operator. 8-54 MHz HF. VHF Amateur and FM Broadcast Amplifier Repair. Ω 1. OM4001A HF Linear Amplifier The OM Power model OM4001A is an automatic power amplifier, designed for use on all short wave amateur bands from 1. 57 Tube amplifiers are a popular project among hams. It is not known if a 4 tube HF linear using QQE06/40 tubes has been made. Although the HF-2500 was a great amplifier, I prefer tuning a triode over a tetrode amplifier. 0: QY3-125: 45: W2DTC's HOMEBREW 3CX3000F7 TRIODE GROUNDED GRID HF LINEAR AMPLIFIER: Schematics at bottom of Audio tube amplifiers: Ampage tube amplifiers, schematics, parts: Amplifier classes: Amplifiers EL519 Linear FRINEAR-400PG, 400W, 4 × PL/EL519 (passive-grid), GU43B (Q-1P/42) HF Amplifier FRINEAR-1500, 1500W using Russian ГУ-43Б, Heathkit SB-200 modifications, Heathkit SB-230 modification, HV Supply 1300V & 2200V, Kenwood TL-922 modifications, RM Italy HLA 300, a close survey of the Any tube amp can be modified and the sound shaped, but it's basic character will not change. There are 141 suppliers who sells hf tube amplifier on Alibaba. *6 25 ⁄ 32 (H) x 2 25 ⁄ 32 (W) x 9 1 ⁄ 16 in. 57 $ 30 . The ACOM2000A is a complete and self-contained linear amplifier that covers all amateur bands from 1. It is only 11″ wide, 4″ high, and 9″ deep. I have found  1 Nov 2018 of a SPICE model of the tube amplifier. This tube is no longer made but is one of the smallest tubes that can be rebuilt. AMPERE). Our HF TX system philosofy has been, since many years, to have available an amplifier which needs a drive level (ONLY when necessary) around 50 to 65 watts MAXIMUM as RF input level (to get the maximum power available, and legally permitted, from a linear amplifier accessory), o r LOWER, for Hunter 2000C Linear HF Amplifier 80-10 Meters *NICE* $626. Type pulse triode. It was used on 75 meters as this was the only antenna he had. It came to us without any tubes installed or tube indications marked on the chassis. Instruments. Award Information. GROUP STUDENT PROJECT: SINGLE-ENDED CLASS-A TUBE AMPLIFIER – AUG 10, 2007 2 This configuration serves two major functions. 4-KWatt; 4CX15000 HF Linear Amplifier HF Amplifier with 1 4cx15000 35-KWatt Dec 12, 2019 · 10 Watt HF Amplifier Inventory and Parts List Note: Band kits are included in separate packages and are listed in the table on page 10. A valve amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a signal. If these amplifiers are operated within their design parameters and not abused, the tube(s) will usually outlast the operator!. F. 02. Pentode tubes amplifier with grid grounded a very easy to build and the bias is just a piece of cake to achieve. There are 379 suppliers who sells hf linear amplifier on Alibaba. The anode choke is a very important part of the amplifier, it allows the HV DC to the anode of the valve,. Some inexpensive 811A amplifiers are available, but the Chinese 811A tubes fail early. 95 * Buy It Whether you’re looking for HF or VHF amplifiers you’re bound to find them here. What makes a good HF amplifier (tube type) amp, is a sure sign of a good unit. Welcome to TubeDepot Javascript must be enabled to use this site. 70% efficiency The AL-80B is built on a rugged steel chassis. I am very pleased with the EICO HF 81. Go to next LDMOS RF Amplifier 3000 Watt PEP 1. Amplifiers • HF, VHF, & UHF • We design and build custom amplifiers to meet our customers' needs • Amateur, commercial, broadcast, military, scientific, & industrial purposes • Manufactured in the USA CLANK HF Linear amplifier with 2 3-500Z; Amp hf 3000 WattAmplificatore lineare hf con Parallelo di 2 4CX800; LA0BY Amplificatore lineare Vhf con Push pull 2 4CX250; SM5BSZ Building High Power Amplifiers page; How To Run Your (Tube Type - Ed. HRO Discount Price: $2,169. Enhanced packaging for additional protection during transport. To its right is the white tank coil with the gray variable capacitors in the bakground. At 100 watts of drive power the amp will easily produce 1500 watts out. A complete test with report sheet. It will work 160 meters through 10 meters and output power is slightly over 1000 watts. Results 1 - 28 of 28 Vintage 1950s Pye High Fidelity HF 5/8 Mono Hifi Valve Amplifier Amp Serviced. Page 10. With 60 watts of drive I get 1KW SSB PEP out on all bands. The linear amplifier OM2501HF is a manual tune designed for all short wave amateur bands from 1. $66. It operates in class AB2 for SSB and CW. The top countries of supplier is United States, from which the percentage of hf linear amplifier supply is 1% respectively. Ameritron AL-1200X, QRO HF-2000, Kenwood TL-922, etc) removing the cover we are often impressed with the design, the few components but how big, the care and finish of the work brought up to the band-switch and cosmetics. These amplifiers were sold in three different ways, a semi-complete kit, a complete kit, and a finished product. And, the 400 watt output sweep tube amps may not produce enough power plus the tubes are very expensive. Sixteen transistor mobile amplifier. keysight. Even the priced of a used Ameritron AL-811H is prohibitive. Branch: Air Force. The amp uses a 3-500Z tube. Be prepared and able to communicate in case of emergency with the largest selection at eBay. The main knobs on an amp adjust speaker frequencies and tone levels while sounds are distributed through the environment. KL-501 Mobile HF Linear Amplifier : 2ir473: 5 : 1 : 5-01-07 9:33 am: Amp audio problem: Romstar: 8 : 1 : What kind of tube tube amp do i need to keep the peace Description. 5 kw depending on drive and HT. The outstanding features of low voltage, high current and a high ratio of transconductance capacitance are also properties of this tube. This is important when it comes to being heard over the percussion of your band or group, but it also plays another roll in the music you’re creating. The amplifier is shipped in three cartons: amplifier, transformer, tube. 8 to 29. HRO Discount Price: $2,995. 811A tubes offer rugged, reliable HF linear amplifier. 8MHz – 50MHz power amplifier with additionalcapability at 472kHz. Remember, the amp’s protection is the last line of defense before failure. Working parameters of the amplifier are indicated on a multi-function, high-resolution 5 inch color display. The latter have more flashovers after a long unused period. But conventional vacuum tube amplifiers, as well as sounding warm and circuit will be inherently subject to high frequency overload and clipping distortion. Other Outstanding Features. category is a curation of 95 web resources on , 811 Linear Amplifier project, HF Tetrode Linear Amplifiers, 4 KW RF Amplifier. by Command Technologies, Inc. These tubes are good amp tubes. And the AL-800 will even run from a 20-Amp 120 VAC line source if desired. Tube Amplifiers: Also known as valve amplifiers, Comparing to solid state amps, tube amps also happen to be a loud louder for their listed wattage; a 50-watt tube amp will be a lot louder than a 50-watt solid state amp. Ameritron is the World's High Power Leader 1kW HF AMP w/3-500ZG TUBE, 110Vac US $1,665. RM Italy BLA 350 Plus HF Solid State Amplifier (120 Volts) $890. The OM4000A can control a switch of up to ten antennas and select up to ten filters. 0) hf tube amplifier, and whether hf tube amplifier is ce, or fcc. Watch carefully how you treat a solid-state amplifier. 48 Oct 04, 2011 · The HF-2500DX price is $2,895. HF-300. 59 shipping. They are capable of about 1 kw to 1. or Best Offer. Russian impulse triodes Gi7i are cheap rugged tubes. MODE AND DUTY CYCLE. You can also choose from ce, fcc hf amplifier, as well as from professional amplifier, mini amplifier, and home amplifier hf amplifier There are 448 suppliers who sells hf amplifier on Alibaba. 2 KW on 10 meters), operating on bands from 160M-10M. Before unpacking each carton, check the exterior of the shipping carton for any sign of damage. Audio tubes for any amplifier: from high end home audio to classic guitar amps. specializes in amplifier transformers! More than 80% of our transformers manufactured is for this market and bring over 70 years transformer manufacturing expertise to our product. AF Power Amplifier or Modulator. 6dB RF Amplifier Signal Receiver FM HF VHF/UHF Ham RM ITALY KL 35 KL35 AMPLIFIER LINEAR HF / CB / 10M . Heathkit SB-220 modified with extra tube, blower, and Peter Dahl tx. It should also be used on the ring terminal used to hold Diode D2. The tube which satisfies the technical requirements of the project “Tsunami” for sure without The plate high-voltage transformer of the Tsunami power amplifier is 8: Grid input: adjustable input inductors (bottom), HF input resistor (right of  2016/10/06 - HF Linear tube amplifier 500/600W on 2xGI7B | Consumer Electronics, Radio Communication, Ham, Amateur Radio | eBay! Amplifiers. These amps provide you a comfortable 1,000 watts output on all amateur bands from 160 through 6 meters. is no longer in operation. I4FAF Amateur Radio HF "really" linear, rugged and trusted, Tetrode Tube Linear Amplifier experience. 95 * Buy It To download the project files referred to in this video visit: http://www. Linear amplifiers come in a range of options, from 600-watt PEP output to 1,500-watt continuous power that let you operate with authority from 160 through 2 meters whether RF Amplifiers HF, VHF, UHF, SHF. Feb 01, 2015 · The first Sansui amplifiers introduced include the HPR-100(120), the HPR-150(200), the HF-2A3S, the HF-A3K, the HF-6V6P, and the HF-V6K in 1954. 00. Basic amplifier concepts, types & operation. I couldn't find one. These amps generate loud, bold effects by relying on 120-watt hardware. This amplifier set is a modern, updated version of the venerable EICO  AMPEREX TRANSMITTING TUBE HF-300. With faster and quieter band switching and auto tuning  you see is what you get, Manual of this tube is here, Tubes are new, were not used, from a military warehouse, NOTE: From the correct putting into operation  Valve HF amplifiers were built on a CNC cut and folded steel chassis that was rigid and hard wearing. 3 out of 5 stars 2 $30. Introduction: A solid-state HF amplifier differs fundamentally in its design concept from a tube amplifier. Click any picture larger:>> Some assembly required This HF-2500DX arrived in three boxes, small, medium (heavy) and large. Above: Notice that I tapped the main inductor coil. The ACOM 1000 gives you a comfortable 1000 Watts output on all amateur bands from 160 through 6 meters. Four 572B tubes give you more plate dissipation than a single 3-500Z tube. 5 x14. 18 Ameritron HF Power Amplifiers are the most popular HF amplifiers in the world! Ameritron leads the industry with time-tested designs that offer the best value for Amateur Radio operators and HF experimenters everywhere. You can also learn more about vacuum tubes and tube amplifiers. 8V DC, usually portable, because the longest is the output/drive power curve, the better is the linear portion. HF power amplifier using GI7B . Vacuum Tube Amplifiers by W8JI A wide variety of hf linear amplifier options are available to you, such as 2 (2. Layout: Here, you must decide if you want an "all-in-one, desk top" amp, or a "floor console", or a "two-piece" unit. Adam Farson. You can also choose from datasheet hf tube amplifier, as well as from 2 (2. 00 Tube choice depends on power level, frequency and budget. Jul 22, 2009 · An inoperative filament in even one tube can cause the whole amp to fail. Anode voltages are in the 700V to 2kV DIY Kits 70W SSB Linear HF Power Amplifier for YAESU FT-817 KX3 Ham Radio Suitable for FT-817 KX3 Other Small Power Stations 2. com/index. Our mono & stereo Vacuum Tube Amplifier Kits come with everything needed to build a great sounding amplifier, pre-amp or Tone control unit. The first is the filament transformer whos job it is to supply correct volt and amp ratings to the tube filaments and provide a path for the HV negative line to reach the zener diodes and resistor which effectively shuts down the tubes when idle that control tube bias. 95*. com! - Hifi Amplifiers, Audio Cable,Tube Amps,CD Player,USB DAC,Vacuum Tube  A three-tube, two-stage Hi-End low-frequency amplifier unit with direct connection between the stages allows you to create a high-quality amplifier with an  A three-tube, two-stage Hi-End low-frequency amplifier unit with direct connection between the stages allows you to create a high-quality amplifier with an  Добро пожаловать на вебсайт TUBES for AUDIO. HRO Discount Price: $1,799. 85. Agency: Department of Defense. 95 Special Order : AL811 : AMERITRON AL811: 600Watt LINEAR (3) 811A TUBES Oct 07, 2019 · The right high-power HF amplifier or solid-state amplifier for your station can deliver the DX punch you need to get heard loud and clear when faced with pile-ups and QRM. OM Power OM-2501HF - Heavy Duty Legal Limit HF Manual Tune Amplifier. The front panel was bolted directly to the front of the chassis. Like vacuum tubes, transformers are vital to the sound and performance of your amplifier. Fast & Free shipping on many items! EXTREMELY RARE WORKING Kem-Tron Interceptor 300RX Sweep Tube Amplifier. If I want a different sound, I'll use them. The tubes are also troubled with flashover with more than 50 W from the exciter and then the 230 VAC fuse blows. $152. All articles are presented in a secure PDF file format that you can download and read  The famous PL519, a sweep tube from 1970ies color TV sets, is shown below: In my humble opinion, building at least one tube amplifier in your life completes  26 Nov 2009 This video contains photos soviet tube and linear power amplifiers HF in performance amateur radio. Nov 19, 2015 · ICON AUDIO MP3 Price: £450 www. $7,925. Learn about the dangers of tetrode tubes in a swamped input HF amplifier. The FL-2100B is know for it's reliability, using rugged 572B amplifier tubes, high quality The resource is currently listed in dxzone. 400W: 40. Among other components, it contains a water cooled 3CW30000H7 Power Triode Tube (Rebuilt by Econo), a Comet CV1C-300H/15 Vacuum Variable Capacitor (10 - 300pF, 15kv / 9kv), a Jennings CVDD-100-15S Variable Capacitor (10 - 100 pF, 15kv), a MYAT Transmission Line Incident Coupler, and a pair of Bird 10-T-MN Terminations (10 watts, 50 ohms In an RF amplifier it is necessary to supply DC plate voltage to the tube (about 600 volts in this case) and at the same time extract the amplified RF that appears at the plate of the tube. 5", the more compact AL-800 uses a single 3CX800A7 to provide 1250 Watts PEP SSB and 850 Watts CW with 85 Watts typical drive level. Our 500-W output amplifier gives us a smidgen more than a one S-unit boost on the other end (see Figure 1). A 70cm amplifier capable of giving legal- limit output when driven by my current rig. Most high-quality amplifier tubes have a lifetime of about two years if they are cared for and maintained properly. Alpha 78 Amplifier. 22 watching. W. Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers in the 1960s and 1970s. Great deals on Hf Linear Amplifier. If you aren't sure about which valve you need, or what tubes you can substitute, let us help you. Ending Nov 8 at 6:00PM PST 3d 21h. The amp will work 10 through 160 meters. AMERITRON AL-80BG Linear Amplifier Single 3-500Z HF 1000 Watts PEP with Grid Protection Circuit. HF amplifiers for ham radio use. The Distance and the HF Amplifier to Reach It . Ameritron HF Power Amplifiers are the most popular HF amplifiers in the world! Ameritron leads the industry with time-tested designs that offer the best value for Amateur Radio operators and HF experimenters everywhere. Any company that manufactures an amp and goes to the extra expense and trouble to install these high quality transformers, has reliability and power reserve in mind. This page might be a bit long, but it explains how and why you need to adjust the amplifier in a certain way. power supply. Resources listed under Amplifier category belongs to Amplifiers main collection, and get reviewed and rated by amateur radio operators. com hf Sort by: Sort by Featured Items Newest Items Bestselling Alphabetical: A to Z Alphabetical: Z to A Avg. Build a 6-meter 85 watt PEP SSB amplifier using a MRF 492 BJT. Export Only. or Best Offer  Hello there and welcome! The Amp Supply "LA" series of HF Amateur Amplifiers use 4 or more common "TV Sweep Tubes" in a classic grounded grid circuit layout  AMPEREX TUBE TYPE HF-300. Suitable for all amateur modes thanks to an all-copper, high efficiency heatsink. The 1M resistor maintains a path from grid to ground regardless of the state of the input of the amplifier, preventing potential damage to the driver tube caused by source failure[4]. Apparently this is some kind of classic, or reference, project. Here's a quick look at the new facelift Acom 1000 in all its glory!!! Cheers  Do I need an amplifier with tubes or solid-state devices? • If tubes, is one tube enough? • Pi or Pi-L? • Why do I need a 3 KVA power supply when I can only run   Results 1 - 48 of 903 Great deals on HF Ham Radio Amplifiers. Vacuum tube amplifiers how a PA Converts DC to RF. 5kW automatic amplifier with GU78B tube to our portfolio again, this time in a new version. EXTREMELY RARE WORKING Kem-Tron Interceptor 300RX Sweep Tube Amplifier. See the optional Remote Contr. <As of Dec. 160 - 10 m. 1 October 2005. C. Their High Power Vacuum Tube Linear Amplifiers and Solid State "No Tune" Amplifiers will take your HF operations to the next level. 8-29. That’s not much—especially when you consider the cost. This N-Channel enhancement mode silicon gate power field effect transistor is an advanced power MOSFET designed, tested, and guaranteed to withstand a specified level of energy in the breakdown avalanche mode of operation. Ameritron is the World's High Power Leader! by Adam Farson, VA7OJ/AB4OJ, May 2002. hf tube amplifier

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