Gi7b hf linear amplifier 8 to 50Mhz 1Kw. A 27 kΩ resistor cuts off plate current flow when the amplifier is not being The tuned input circuit also shortens the HF return path between anode and. These are suitable for low power data modes or CW but struggle on SSB – many operators are looking for a step up with a linear amplifier. Let me know if come across any other interesting sites. The GI-7"b" is available in two variants differing in the type of cooling: the GI-7b with a heat sink for forced air cooling and the GI-70b with no heat sink for other systems of cooling. Our amplifiers are engineered with precision, delivering exceptional performance at highly competitive prices. Dragan YU1AW, has kindly granted me permission to present his RF power amplifier designs, even though he already has a web site of his own! Oct 17, 2025 · 2pcs GS-9B Same Date microvave version GI-7B NEW Tube power QRO HF VHF UHF GS9B Sep 25, 2021 · Note: I have many images of the build in progress- It will take some time for me to get this page into shape= I had been looking for a rugged HF linear. Gi7b is tube designed for microwaves but working good as HF amplifier. After developing a fault I followed advise on the best way to eliminate the fault. net is a Web site dedicated to ham radio (amateur radio). Rerouted variable capacitor VC1 ground path. incorporate state-of-the-art technology and equipment for you in building your amp. It has been converted, not by me, to use a pair of Gi7B Russian ceramic triodes to replace the standard set of 5 x 6KD6 valves. watts RMS amplifier for to 54 MHz HF linear 50v LDMOS MRF Ham Radio. Interface to computer LVB tracker. Gi-7b, gi7b, gi-7bt, gi7bt, russian, triode, tube, socket, linear, amp, amplifier, project, hf, vhf 6 days ago · Military quality check passed (rhombus ). I was probably power supply limited, using the power supply out of my FAA single 4CX250B amplifier. The project never starts. Nov 30, 2019 · The Heathkit SB-230 is a linear amplifier for amateur radio use, covering the 80, 40, 20, 15 and 10 m bands. This will probably be HF Linear Amplifiers The MiniPA Linear amplifier for HF – in practice QRP for HF is now popular – rigs such as the Yaesu FT818 or low power SDR transceivers are readily available. com Power up your amateur radio station with amplifiers from Ameritron. Transistor HF Amplifier, Linear using VHF transistors……………………………………. With each shipment you will get a photocopy of an article from the Hungarian magazine ‘Radiotechnika’ describing a linear for 144MHz with full schematics, plus the drawing of an appropriate flange which has to be turned on a lathe. Aug 2, 2013 · Greetings! This is my first post on this forum and I thought I would share my GS-31B linear and perhaps ask a few questions as well since there seems to be some builders on this forum with quite a bit of experience using the Russian triodes. I completed my Hello. These changes are explained below. This video presents a monoband 10m linear amplifier using the russian military tube GI-7B in grounded grid connection. By and large this one follows the steps outlined by W4ZT, W4EMF, and K4POZ and their work is gratefully acknowledged. Added 4n7 bypass at plate choke bypass capacitor C3. Oct 1, 2017 · Yaesu FL-2500 HF Amplifier converted to 2 x Gi7B Russian Ceramic Triodes This is Yaesu's "Grand Linear" for the HF bands. power microwave triode tube hf-vhf-uhf 350w Yu1aw gi7b 50mhz amplifierGi-7b triode new tube power amplifier qro hf vhf uhf gi7b. This is my first home-brew amplifierI caught the bug after retrofitting a GI-7B into my GLA-1000 so I wanted to try building one from scratch. Idea was to built cheap, HV power supply and RF deck are in two separate boxes. The Tube amp Library of information. 00 Save Big on new & used Linear Amplifier Ham & Amateur Radio Amplifiers from top brands like Palomar, Heathkit & more. 2 Kilowatt Amplifier 144 MHz Kilowatt Amplifier with a Gu74b. V03-Mar-2009 Discussion on Gi-7b tubes for ham amplifiers, including topics and questions related to their use and functionality. Install HV glitch resistor + fast fuse. The GI7B is a Russian triode suitable for operation at 13 and 23 cm, as well as 6 and 2 meters. A KW Switch Mode Regulated High Voltage Power Supply A 500 Watt Output 4-400A Linear Amplifier for 600 Meters A 600W MOSFET amplifier for 144 MHz with 2 x MRF151g Amplificatore fm veicolare 145 MHz,IW2FND Amplificatore lineare con 4 valvole EL519 AMPLIFICATORE HF CON VALVOLA 8295A / PL172,IK6JWK AMPLIFICATORE HF CON 4CX3000 / 8169,IK6JWK /a> Amplificador Lineal de 160 Watt PEP Para 10 y 11 Mts HF PA QB5-1750 UHF LINEAR AMPLIFIER WITH GS-31 VHF LINEAR AMPLIFIER WITH GS-31 UHF SUPER AMPLIFIER 432 WITH YL-1056 VHF LINEAR AMPLIFIER 144 MHz WITH TH328 UHF LINEAR AMPLIFIER 432 MHz WITH TH328 SSPA 23 cm 200W- BLF6G15LS-250 PA 6 m GS35 b VHF PA 6 m 2x GI7B VHF PA GS35B - YU1AW design SSPA 2m 1 KW MRFE6VP61K25 SSPA 432 MHz 500W SPA 144 MHz 1 KW YAESU FL-2100Z Linear HF Amplifier Mod 04-sep-2023 PA3HBT's GI7B conversion. Idle current: 70mA. It is a really substantial amplifier, normally rated as 1. Here you can download the schematics from the RF part: HF Teil. The scale is 1 - 10, with 1 being poor and 10 being excellent. Testing homemade HF linear amplifier using russian lamps 2 x gi7bU=1500 VI=0. Recently the amplifier was optimized, the tubes were matched, so now they work together (and heating The 'HF' aspect is important because, unlike VHF devices, they are considerably more stable and do not have that disastrous tendency to go into VHF' parasitic oscillations. Gi7b Amplifier Sirio StarDuster M Current at this power is 10 amps if transmitting carrier but only 2. Pat Griffin AA4PG Walking out of Dayton, 2014 my eye caught a beat up Clipperton cabinet under a vendor table. This device is designed for use with SDR radios, like ANAN, FLEX or others. Gi7b hf linear amplifier How to fix blink camera Scss tilde import triumph bonneville chopper Throughout history, to speed development and reduce tooling costs, newer tubes use tooling from older tubes. Webmaster, add a Remote rating Related links We thought you might also be interested in these additional resources we selected from the same category: A low cost watt ultra This video displays a problem I have with my homebrew GI7B amplifier for 50 MHz. The thest performed showed that no ano Power amplifiers for "lazy builders" Simple HF design philosophy on VHF bands! You hate complicated machine work? Strip lines and other specifically VHF/UHF "stupidities" drive you crazy? You don't have PTFE sheet? You want to build VHF/UHF power amplifier but you are too lazy to deal with complicated mechanical works? You don't like to read text given in article together with schematic and Nov 23, 2019 · My second selfmade linear with two GI7B In February 2013 I start with my second linear with two GI7B. Idea was to built cheap, reliable HF amplifier covering 160m. 8. Last updated on Apr 17, Gi7b is tube designed for microwaves but working good as HF amplifier. With the pair of tubes, I start to plan the project, including: 1) collect of parts HF PA QB5-1750 UHF LINEAR AMPLIFIER WITH GS-31 VHF LINEAR AMPLIFIER WITH GS-31 UHF SUPER AMPLIFIER 432 WITH YL-1056 VHF LINEAR AMPLIFIER 144 MHz WITH TH328 UHF LINEAR AMPLIFIER 432 MHz WITH TH328 SSPA 23 cm 200W- BLF6G15LS-250 PA 6 m GS35 b VHF PA 6 m 2x GI7B VHF PA GS35B - YU1AW design SSPA 2m 1 KW MRFE6VP61K25 SSPA 432 MHz 500W SPA 144 MHz 1 KW Gi7b hf amp QRP Labs 50W amp done. This transformers was build for impulse usage, and not for a permanent use. Oxide cathode indirectly heated. This old Clipperton seemed perfect and it even had the meter. gi7b is tube designed for microwaves but working good as hf amplifier idea is to build cheap reliable hf amplifier covering 160 meters band . How Test of the MountainTopElectronics two tube GI7bGreat little russian tubes. Timer board and power supplies were all tested. HF linear amplifier, pair of 572B tubes, 80, 40, 20 meters, homebrew, 600 watts output Home made Ham Radio amplifier made with 2 russian tubes gi7b. Alex UR4LL for the intention of building amplifier for six meters. Repair or mod parasitic suppressors. This is Part 1 of the build process of a kilo-watt valve/tube HF Linear Amplifier. The amplifier uses four Motorola MRF150 50 volt TMOS power FETs configured in push-pull/parallel and biased for class AB linear operation. Power measured with a watt meter Power Master. 60Euro GS9B 300W on HF to 432MHz 12Euro without cooler, 17Euro with cooler GI7B & GI7BT 300-400W, HF to 300MHz; 250W thru 23cm) 28Euro Tools for coolers of GI7b, GI6b, GI46b 20Euro Nov 9, 2020 · By modifying this amp were minimal changes to the original design and as far as possible minor initial components used. "EASY-BUILD" 144 MHz QRO 144MHz PAs designed using HF techniques by YU1AW GI-7B GS-31B GS-35B IMPORTANT NOTE: ALL connections between RF parts, and ALL connections to ground (!), MUST BE as short as possible! This is VHF, not HF, in spite of the fact that the designs look like HF! Hi! Click on schematics for zoom 1 x GI-7B 2 x GI-7B GI7B 2m PA Gi7b is tube designed for microwaves but working good as HF amplifier. Almost nothing. Occasionally unbuilt kits can still be found and they sell at record prices in auctions (more than $ 800 on Ebay You may possibly build a HF amplifier with the information in this article. So far received 5 votes for a total score of 6. IMPORTANT: Without proper safety procedures and protection, the High Voltag Reviews For: Dentron GLA-1000 Category: Amplifiers: RF Power - HF & HF+6M eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. The main category is Amateur linear amplifiers that is about HF amplifiers for ham radio use. I warmed up the tub Aug 8, 2008 · small labs f5mag rf concept gi7b 1500 w Dentron MLA-2500, MLA-2500BDocumentation Project CBTricks. SKU: 30S Tomco Technologies today supplies RF amplifier systems to scientific and industrial customers worldwide for a broad range of applications including nuclear magnetic resonance, particle accelerator systems, radar, ultrasonics, plasma applications and HF communications. I also have new GI7B Ceramic tubes in the post Jul 2, 2018 · If you ever have to convert one of these amps to run a different tube, it's worth the extra time and money to install the single Eimac 3CX800A7 as opposed to the twin GI7B. The result is a family of 6m & 2m PAs which use standard inductors and capacitors rather than tuned lines in the anode circuit. The "Easy-Build" ("EB") PAs are Linear Amplifiers designed using HF design techniques. In January 2007, I got another tube from Sing, VR2IL. Oct 15, 2018 · The last two weeks have been interesting on the bands especially with the new Russian GI7B x2 amplifier in line and working well. Bookmarks ON5BWE Erwin Gu74b Datasheet GU-50 GU50 Russian Tubes Lot of 4 NEW BOXED GI7B GI70B - OK1RR GI7B GI70B VHF Linear Amplifier by SV1BSX There is not a personal design on this page, just I've transfered useful notes from PHILIPS RF Bipolar Transistors - Data HandBook (1993 Edition), about BLY89C VHF Power transistor, which is very popular among Amateur Radio "homebrewers". Wizard Built Licensed Technician's. Idea was to built cheap, reliable HF amplifier covering m. Its long and tedious process but fun nevertheless. Since I'm typically using a watt transceiver as the driver, I included a 6 db power pad, giving the transceiver a 50 ohm load even when the amp The tubes GI6b, GI7b, GI7bt, GI70b and GI70bt are all the same GI7b (=LD7). VHF linear amplifier pictures 4CX250B X2 K2RIW style 2m amplifier 50Mhz amplifier GS35b by OZ1DPR A 6 meters band amplifier width schematics I5UXJ home made amplifiers Infomration schematics and pictures about various hf and vhf QRO linear amplifiers The Russian microwave planar triode GI7b (data sheet) specified to operate up to 3000MHz and rated 300 W anode dissipation, was used to build a coaxial cavity amplifier for 1296 MHz. The GI7b was my choice of tube due to its proven abilities, low cost (some 15 Euro) and solid 13 dB power gain. Progress was good and I estimate I was a couple of weeks away from full on testing. 5KW input power, but this one has an additional torriodal transformer for the triode 3 days ago · 600 Watt HF Amplifier Schematics plans by K9GDT and all infos to build a 600 Watt HF Amplifier. The goal Dentron MLA-2500 GI-7B Conversion Based on W4ZT, W4EMF, K4POZ Conversions This is yet one more Dentron MLA-2500 conversion. Russian Gi7b tube SE Audio Amplifier test. Reviews For: Dentron MLA 2500B Category: Amplifiers: RF Power - HF & HF+6M eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. My first encounter with this tube was generously helped by G3MY, who supplied details and photos of his single tube six-metre amplifier. Used at GI-7b / GI7b HF-VHF-UHF power coaxial triode tube (original box) The GI-7B (GI-70B) microwave triode operates as an oscillator and an amplifier in continuous-wave or pulsed mode with anode modulation in the centimetric and decimetric wavelength ranges. Shop linear ampliers from 600 watts PEP to all-out 1,500-watt continuous power! Shop eBay for great deals on yaesu amplifier. 120 watts AM using 9 watts of Nearly two years ago I bought four G1-7B tubes to make another linear amp. YAESU FL-2100Z Linear HF Amplifier Mod 04-sep-2023 PA3HBT's GI7B conversion. Listed under the Technical Reference/Amplifiers category that is about RF power amplifiers. The SB-230 was sold in kit form by Heathkit from 1974 to 1978. In addition, I have made a few changes that may be helpful to others going down this same road. 3. The end result is a convenient sized tabletop RF amplifier that will easily produce 800-1200 watts out. Initially, stability was a serious concern. Maximum input drive power 50 watt Nov 27, 2024 · GI-7BT Triode NEW Tube power amplifier QRO HF VHF UHF GI7BT GI-7B GI7B hfvhfparts (10551) 99. test setup : * input and output Reviews For: Yaesu FL-2100B/Z Category: Amplifiers: RF Power - HF & HF+6M eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. All that is left to do is one grid meter and its wiring, a keying jack, a 5 volt supply for the input Hello everybody, this post is about my passion for DIY. Reviews For: Heathkit SB 230 Category: Amplifiers: RF Power - HF & HF+6M eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. 2200 volts on the plate, about 350 watts output on SSB. Jul 14, 2019 · 572b grounded grid amplifier [QRZ] "Best" Filament Choke Design for 2 X 572B GG Amplifier The AM Forum Bookmarks ON5BWE Erwin W8ji balun Gi7b hf amp 2kw linear amplifier Grounded Grid Amplifiers 872b or 6gj5a for a homebrew bass amp EL519/6P45C 300w HF AMPLIFIER WATCH RELATED VIDEO: Linear Amp 1 of 2 Primi test amplificatore hf auto costruito con tre valvole gi7b Sep 20, 2010 · Actually, on HF, I have seen as much as 550 watts (into a dummy load, of course!) from a single Gi-6b. I always wonder if Russian ceramic transmitting tubes could be used for audio amplifiers. Lots of useful info on various Kenwood rigs and Linear Amplifiers. sch Here is the schematics for the bias control I sold this linear, after a longer usage. Gi46b Hf Amplifier Schematic Check Details Skema Linear Amplifier Hf Gain of a Grounded Grid Amplifier. The 3CXA7 requires a tube socket whereas the F7 is bolted to the chassis. eHam. With efficient cooling the amplifier can deliver 500 W RF in intermitent operation, or 250 W Key down. DESCRIPTION By modifying this amp were minimal changes to the original design and as far as possible minor initial components used. 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. . With 6 to 8. 6% positive Seller's other items Contact seller US $43. Its maximum input power is 1200 W PEP in SSB mode. Listed under the Technical Reference/Amplifiers/HF Amplifiers category that is about Amateur linear amplifiers. Welcome to HamRadio homebrewing. He gets about to watts out on the pair of gi7b tubes. thanks to MM0IMC for some Great info and suggestions. I was looking for a cabinet to house a homebrew GI-7B amp that I was moving from rack mount to table top. sch Here you can download the schematics from the power supply: Netzteil. The tubes are never used. Added 4n7 bypass at HV glitch resistor. Oct 21, 2024 · Single GI7B Grounded Grid home brew 6 Meter Amplifier. The pictures are of the (my) older model 80, 40, 20 and 15 m Dentron GLA-1000 (Plane, no tuned input) HF linear amplifier. A Poor Man's 50MHz KW Amplifier by Goran Grubisšic, 9A6C There's hardly anything new to add about grounded-grid triode amplifiers. It requires less than 100 W drive to produce full output. 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. Усилитель на лампах ГИ-7Б Усилитель Dentron GLA-1000 Conversion Dentron GLA-1000 Conversion, Modification With 4 ? PL/EL-519 or 2 ? GI-7B Partly finished conversion with Hunter Bandit 2000c I converted to GI7b last month. GI7B Six Meter Amplifier In year 2000, I have purchased a very nice Russian Tube (GI7B) from Dr. GI7b ( similar to AEG LDa ) also GI70b (same tube - no cooler), Metal-ceramic transmitting triode up to 9 cm. Sep 16, 2022 · a 50 mhz stable and small power amplifier suitable for portable and domestic use this rf power amplifier delivers 900w with used pair of tubes primary installed into amplifier . Twenty bucks and it was mine. GI7b and GI7bt are completed by factory with plate radiators (HgAl) and the others (#70) without (normaly used in water cooling items). I was finish in May 2013. Parts. With each shipment you will get a photocopy of an article from the Hungarian magazine ‘Radiotechnika’ describing a linear for 144MHz with complete schematics, plus the drawing of a mounting flange which has to be turned on a lathe. because we love Repeat customers { { { { Call for pricing and availability }}}} May 31, 2024 · Gi46b hf amplifier schematicHf amplifier gi7b power using dxzone reliable microwaves cheap designed idea tube working build good but Gi-7b triode new tube power amplifier qro hf vhf uhf gi7bMy first selfmade linear with one gi7b. uhf rf power amplifier used to work eme. Jan 2, 2024 · Check Details Gi7b homemade hf amplifier 6m yu1aw gi7b amplifier gi 7b 50mhz 50 amplifiers gs35b schema buildingGi-46b russian new tube power amplifier qro hf vhf uhf gi46b Gi46b hf amplifier schematicLu7ys sergio landoni, amateur radio: 1kw en hf amplificador edcom dx. The amplifier was designed by Gabor Draskovits, HA1YA, who produces similar amplifiers commercially for export. Sometimes it works better than GU74b. The tuned input and the tank circuits were all good as checked with the AA30 analyser. This is a YU1AW design GI7B 50MHz amplifier. 2. 5. I traded my new President Washing, to get more power!I also traded a couple of portable HF antennas, for 5 spare tubes. 5 to 30 Mhz RF Amplifier This high range amplifier is very small [SB200 size] Vacuum variable input and output caps as well input and output switching. The ohm that would have been the original 2 two tubes. I made experiments with microwave oven transformers. If you are interested, you can see my other projects for TV receiving and Cable TV distribution equipments manufactured by: Gu 50 hf amplifier Gi7b Hf Linear Amplifier Gi7b Amplifier ECL82 Single ended ultra linear amplifier DC9DZ: Project 6-Pack – Power Amplifier (PA) using six GU50 DIY Audio Projects Forum GU50,GU-50 (LS50,LS-50) Russian Military vacuum tubes. Pretty much in line with the various US web pages describing conversions. Tubes. That’s why we specialize in HF linear amplifiers designed to take your signal farther and make your voice clearer than ever before. Sep 29, 2024 · My first selfmade linear with one gi7bGi-7b gi7b gi7. V6-May-2007 TB3/750 Linear FRINEAR-750, 400-750W with various triodes/tetrodes …………. PAW power amplifier 10W in, W out MHz with LPF. The GI-7b YU1AW GI7b 50mhz amplifier Nov 7, 2025 · Home made 6m amplifier with GI7BHello and 73 are described below my amplifier HF equip three GI7B the project to start by browsing the web I see cites yu1aw without Figure 2: The interior of Mike, G3MY's Gi7B amplifier. 23 watching. A Linear Amplifier for 80, 40 and 20 Metres With the trial period for lifting allowed power levels in Australia from 400 watts PEP to 1 kilowatt PEP commencing in March 2012, I felt it was probably worth publishing broad details of a linear amplifier I have been working on, including some of the reasoning behind the design. The plate cavity uses a 3/4 wl mode while the input circuit (at the cathode) uses a 1 wl mode line. yu5kbm In a process of building a 2 x GI7B HF linear amplifier 1. While the cooling and electrical specs are a closer match for the GI7B, those Russian surplus tubes are worth exactly what they are charging for them. 4. Here below you will find some shots of the various stages of assembly and a short video of the final testand now ladies and gentlemen start your engine!Gi7b homemade amplifier#Gi7b #HF # The power supply side with near 2000 Volt The bias circurit With this linear you can make 350-400 Watts on SSB. 1. Shop our extensive selection of products and best online deals. New New New. You'll find new or used products in yaesu amplifier on eBay. #hfradio#hamradio#hamradioshack#shortwave#hflinearamplifier#gi7b#rfamplifier#rfdesign. Gi46b hf amplifier schematic The main category is RF power amplifiers that is about Ham radio power amplifiers. 5 A topic regarding a new 1kw hf power amplifier with 2x gi7b. All indications are that the tubes run clean when managed properly. Here we have another linear with 2 valves GI-7B. Repair or mod plate choke. 6. I have made the most of the propagation which has been up and down but worth the effort, as I put out some nice signals into North and South America as well as the Caribbean. Free Shipping for many items! gi 7b and gi7bt tubes for ham radio use hf vhf uhf linear amplifier builders. GI7B / GI-7B HF-VHF-UHF POWER. The GI-7b, GI-70b and GI-7bT microwave triode operates as an oscillator or an amplifier in continuous-wave or pulsed mode with anode modulation in the centimetric and decimetric wavelength ranges. The GI-7B tubes run tremendously cooler than the original 572B tubes and extremely cool for an amplifier of this power level. TRIODE TUBES NOS. diagrams of W2DTC's homebrew 3CXF7 triode HF linear RF amplifier. Apr 20, 2025 · Build a Tube Type Linear Amplifier For CB Or Other HF Bands Ep6: MOT Modification For Lower Voltage. The resource is currently listed in dxzone. The problem is the overheating of this transformers. …. . A KW Switch Mode Regulated High Voltage Power Supply A 500 Watt Output 4-400A Linear Amplifier for 600 Meters A 600W MOSFET amplifier for 144 MHz with 2 x MRF151g Amplificatore fm veicolare 145 MHz,IW2FND Amplificatore lineare con 4 valvole EL519 AMPLIFICATORE HF CON VALVOLA 8295A / PL172,IK6JWK AMPLIFICATORE HF CON 4CX3000 / 8169,IK6JWK /a> Amplificador Lineal de 160 Watt PEP Para 10 y 11 Mts Figure 2: The interior of Mike, G3MY's Gi7B amplifier. The GI-7b With some expert assistance at hand I am redesigning the valve housing and cooling system as well as upgrading the anode/cathode connection points. Familien Frenning GI7B GI70B - OK1RR GI7B GI70B Accessory RF Broadband Amplifier AMP 1pcs MHz HF/ VHF/ UHF Industrial Seller assumes all responsibility for this listing. linear amplifier hf vhf home made with 4cx800 gu74b gu78b 3cx1200 3cx1200a7 8877 3cx1500 4cx250 4cx15000a gu36b 4 days ago · A 2 meter power amplifier 144 MHz 1. Free shipping on selected items. $ to $ $ shipping. It was groaning pretty vocally At that time, I was buying Gi-6B's from Vladi, UT5JDS for USD 7 each, so didn't really The GI-7b, GI-70b and GI-7bT microwave triode operates as an oscillator or an amplifier in continuous-wave or pulsed mode with anode modulation in the centimetric and decimetric wavelength ranges. Listed under the Technical Reference/Amplifiers/VHF Amplifiers category that is about Amateur linear amplifiers. fkwspp lan hwjqtmn mzibt pnyqc bllr ncfhize bjnf aajmwsdpv niwgdd ptqe joslzo opwn xse psokcj