Home : Technical Reference : Amplifiers : HF Amplifiers
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    • 600 Watt HF Amplifier
      Schematics plans by K9GDT and all infos to build a 600 Watt HF Amplifier. The amplifier uses four Motorola MRF150 50 volt TMOS power FETs configured in push-pull/parallel and biased for class AB linear operation.
    • 1.5 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.
    • How modify a CB linear to use in HF band
      how to modify a Cb linear amplifier to use in HAm HF band
    • A low cost 600 watt ultra-linear amplifier
      This compact little amplifier is the brain-child of Pat Murdoch, ZL1AXB, in Auckland, New Zealand. It is only 11" wide, 4" high, and 9" deep. Operates for 40, 20, 17, 15, 12, and 10m
    • 11 KW Linear amplifier by I0JX
      Use 4CX10000D / 8171, RF output power of 11 KW in key-down carrier on all bands. Power was measured with a Bird 4712 wattmeter and a 25 KW slug
    • Build an HF Linear Amp
      Hombrew project to build an HF linear amplifier whose output is 210W for 16W of drive on 80M and max output is 300W.
    • Easy Kilowatt Linear Amplifier
      Rf amplifier for hf ham radio service - includes easy to understand designs and penny-cheap construction details
    • 500 WATT PA by SM0VPO
      500W Power Amplifier by Harry Lythall - SM0VPO
    • MOSFET amplifier for 80 mt.
      Picture index of 150W MOSFET linear amplifier for 80m 1996, includes photos and schematics
    • Homebrew 813 Linear Amplifier
      813 Linear Amplifier Project includes many schematics, drawind and assembling construction
    • QRP Amplifier
      HF Bands QRP linear amplifier by SM0VPO
    • 4 x 813's RF Amplifier Deck
      This amp project was an exercise in cheap! The design criteria was to use only components in the JUNQUE BOX
    • 10 W Linear Amplifier
      This article describes a 10 watt linear amplifier that is capable of delivering over 15 watts into 50 ohms and uses cheap plastic transistors that are used in CB equipment. by Harry Lythall - SM0VPO
    • Yaesu VL-1000 amplifier
      The Yaesu VL-1000 Quadra HF Linear amplifier
    • 4CX1500
      This is a 4CX1500B grid driven amplifier that is built like a tank. The unit is considerably over designed as can be seen in the pictures documenting the construction
    • Ameritron AL-80A modification
      W7TDC modification of the Ameritron AL-80A power amplifier
    • N4IP HF and 6 Meters amplifier
      A solid state amplifier for HF and 6 meters band by N4IP
    • 1500 Watt Solid State HF Amplifier
      This is a project to develop an Open Source reference design for a 1500 watt solid state linear amplifier for 10 through 160 meters by K6IF
    • 100W HF QRO linear amplifier
      Based on Motorola MRF454, schematics and component list
    • SUPERVOX - S 300 - AM CW SSB linear amplifier for 160 80 and 40 meter band
      [ Hits: 3126 | Votes: 2 | Rating: 5.5 ]
    • 1.5 to 30 Mhz RF Amplifier  pop - This high range amplifier is very small [SB200 size] Vacuum variable input and output caps as well input and output switching.
      [ Hits: 52475 | Votes: 42 | Rating: 3.7 ]
    • 10 11 meters RF Power Amplifier - AM/FM/CW QRP RF Power Amplifier for the HF 10 or 11 meterband (28MHz/27MHz)
      [ Hits: 4864 | Votes: 6 | Rating: 5.67 ]
    • 10 W Linear Amplifier - This article describes a 10 watt linear amplifier that is capable of delivering over 15 watts into 50 ohms and uses cheap plastic transistors that are used in CB equipment. by Harry Lythall - SM0VPO
      [ Hits: 11056 | Votes: 11 | Rating: 5.27 ]
    • 100W HF QRO linear amplifier - Based on Motorola MRF454, schematics and component list
      [ Hits: 8750 | Votes: 11 | Rating: 4.36 ]
    • 10m FM Amplifier - 100 W output RF amplifier for 10 meter band project by W4NFR
      [ Hits: 602 | Votes: 3 | Rating: 5.67 ]
    • 11 KW Linear amplifier by I0JX - Use 4CX10000D / 8171, RF output power of 11 KW in key-down carrier on all bands. Power was measured with a Bird 4712 wattmeter and a 25 KW slug
      [ Hits: 23812 | Votes: 29 | Rating: 7.87 ]
    • 1500 Watt Solid State HF Amplifier - This is a project to develop an Open Source reference design for a 1500 watt solid state linear amplifier for 10 through 160 meters by K6IF
      [ Hits: 9251 | Votes: 17 | Rating: 3.29 ]
    • 160m linear amplifier - pictures - Pictures of a homemade monoband linear amplifier for 160m band powered by 3 x QB5/1750
      [ Hits: 294 | Votes: 2 | Rating: 2 ]
    • 2 kW HF Amplifier Rebuild - Heathkit SB-220 amplifier repaired at W8UM
      [ Hits: 7329 | Votes: 6 | Rating: 5.17 ]
    • 2 x 3-500Z HF Power Amp - A 2x3-500Z rf power amplifier for 80-10 meters
      [ Hits: 4150 | Votes: 7 | Rating: 3.43 ]
    • 2 x 4-400A Amplifier Deck - A Class C Amplifier rebuilt with 4-400A tubes by W7IUV
      [ Hits: 2886 | Votes: 3 | Rating: 5 ]
    • 24 MOSFET Class E RF Amplifier - This is a 24 MOSFET Class E RF Amplifier, covering the 80 and 160 meter amateur radio bands.
      [ Hits: 1592 | Votes: 2 | Rating: 4.5 ]
    • 3-500Z Amplifier Project - This article loaded with nice pictures and schematics, describes a 160-10 meter linear amplifier that uses a pair of 3-500Z triode power tubes. It was designed and constructed by William Moneysmith, W4NFR. The amplifier features fast warm up and 1500-Watt RF output with 100-Watts of drive.
      [ Hits: 855 | Votes: 3 | Rating: 9.33 ]
    • 4 KW RF Amplifier - HF power amplifier project powered by GU-78B by SV8JE
      [ Hits: 1266 | Votes: 2 | Rating: 10 ]
    • 4 x 813's RF Amplifier Deck - This amp project was an exercise in cheap! The design criteria was to use only components in the JUNQUE BOX
      [ Hits: 12016 | Votes: 19 | Rating: 5.47 ]
    • 4-1000A Tube RF Amplifier - Home Brew a 4-1000A RF power amplifier project by W4NFR
      [ Hits: 502 | Votes: 0 | Rating: 0 ]
    • 40m linear amlifier made by 9A6A - Pictures of a monoband linear amplifier for 40m band 2 x QB5/1750 made by 9A6A
      [ Hits: 626 | Votes: 1 | Rating: 10 ]
    • 4CX1500 - This is a 4CX1500B grid driven amplifier that is built like a tank. The unit is considerably over designed as can be seen in the pictures documenting the construction
      [ Hits: 10945 | Votes: 10 | Rating: 5.8 ]
    • 5-band RF Power Amplifier - This project uses a widely available IRF510 MOSFET, work on HF 80, 40, 30, 20 and 17 meter bands
      [ Hits: 6702 | Votes: 4 | Rating: 6.75 ]
    • 500 WATT PA by SM0VPO - 500W Power Amplifier by Harry Lythall - SM0VPO
      [ Hits: 18331 | Votes: 19 | Rating: 5.62 ]
    • 60 W Linear Amplifier Circuit - The 60 Watt linear amplifier is simple all solid state circuit using power mosfet IRF840.
      [ Hits: 1986 | Votes: 3 | Rating: 3.67 ]
    • 600 Watt HF Amplifier  pop - Schematics plans by K9GDT and all infos to build a 600 Watt HF Amplifier. The amplifier uses four Motorola MRF150 50 volt TMOS power FETs configured in push-pull/parallel and biased for class AB linear operation.
      [ Hits: 68808 | Votes: 120 | Rating: 4.44 ]
    • 7 Watt HF Amplifier - An RF power amplifier, providing 7 Watts output in HF bands, schematic by ON6MU
      [ Hits: 3169 | Votes: 2 | Rating: 5.5 ]
    • 70W SSB Power Amplifier For FT-817 or KX3 - DIY kits a 70W SSB linear Power Amplifier for YAESU FT-817 KX3 running HF 80m-10m bands
      [ Hits: 1178 | Votes: 7 | Rating: 7.15 ]
    • 80 m Hexfet power amplifier - 80m hexfet power amplifier by W7ZOI
      [ Hits: 3504 | Votes: 3 | Rating: 7.67 ]
    • 80-10m Linear Amplifier - High-power 3-500 HF linear amplifier by Don Pinnock G3HVA
      [ Hits: 2800 | Votes: 2 | Rating: 9 ]
    • 811 Linear Amplifier project - A lower power desktop linear with integrated 120vac power supply. This, very compact, dual 811 version will deliver about 300 watts output. Covers all bands including WARC bands.
      [ Hits: 1383 | Votes: 2 | Rating: 10 ]
    • A 20m monoband Power Amp - The 20m monoband 4-1000 amplifier, by Jelmer (pa5r), Herman (pa0ten) and Frans (pa5ca)
      [ Hits: 2717 | Votes: 2 | Rating: 9.5 ]
    • A 600 Watt homebrew Solid State Amplifier - A solid state linear based on EB104 Motorola Engineering Bulletin by Helge Granberg. It uses 4 MRF150 FETs in push-pull parallel to acheive 600 Watts from about 6 Watts drive
      [ Hits: 1751 | Votes: 3 | Rating: 5.33 ]
    • A LF power amplifier - A Low Frequency (LF) RF Power Amplifier by VK5BR it operates in a linear mode and can handle CW, AM and SSB.
      [ Hits: 3116 | Votes: 1 | Rating: 1 ]
    • A low cost 600 watt ultra-linear amplifier  pop - This compact little amplifier is the brain-child of Pat Murdoch, ZL1AXB, in Auckland, New Zealand. It is only 11" wide, 4" high, and 9" deep. Operates for 40, 20, 17, 15, 12, and 10m
      [ Hits: 30052 | Votes: 23 | Rating: 6.7 ]
    • A simple 50W RF Power Amplifier - A simple RF power amplifier initially designed for 40 meter band can work on 10 15 20 40 80 meters
      [ Hits: 1194 | Votes: 1 | Rating: 8 ]
    • Adding 160M to HF amplifiers - updated original manuscript, article published in January 1989 QST by Richard L. Measures, AG6K, April 1988
      [ Hits: 3048 | Votes: 2 | Rating: 10 ]
    • AL80B Mod - Ameritron QSK 5 PC mod for AL80B
      [ Hits: 594 | Votes: 0 | Rating: 0 ]
    • AL811 trouble shooting - Ameritron AL80B AL811H AL572 Amplifier Trouble Shooting. Tubes replacement, resistor changes.
      [ Hits: 988 | Votes: 3 | Rating: 9.67 ]
    • Alpha 87a Amplifier Fault 1  new - Alpha 87A Amplifier Fault 1 and the downlevel amplifier
      [ Hits: 47 | Votes: 0 | Rating: 0 ]
    • Alpha Amplifier Upgrades - Alpha 77D,DX,SX, Alpha 76, Alpha 78 and 374 repair service and upgrade kits
      [ Hits: 2532 | Votes: 6 | Rating: 10 ]
    • Ameritron AL-1200 to gs35b Conversion - The Ameritron AL-1200 Amplifier is in current production. In its factory configuration it uses a single 3CX1200A7 (triode) tube, grounded grid configuration. Re-tubing the AL-1200 with a GS-35b with success.
      [ Hits: 2485 | Votes: 2 | Rating: 4 ]
    • Ameritron AL-80A modification - W7TDC modification of the Ameritron AL-80A power amplifier
      [ Hits: 10459 | Votes: 17 | Rating: 7.06 ]
    • Amplifier for 15 and 17 meter band - The two linear amplifiers are ment for use with QRP SSB/CW/FM/AM transmitters on the amateur bands 15 and 17 meters can be powered from a 12 volt DC supply by ON6MU
      [ Hits: 1488 | Votes: 0 | Rating: 0 ]
    • Broadband Power Amplifier - A MRF141G 3-175MHz Broadband Power Amplifier DL4MEA 02/1998
      [ Hits: 1838 | Votes: 0 | Rating: 0 ]
    • Build an HF Linear Amp - Hombrew project to build an HF linear amplifier whose output is 210W for 16W of drive on 80M and max output is 300W.
      [ Hits: 22546 | Votes: 8 | Rating: 6.38 ]
    • Converting an HT-41 Hallicrafters Amplifier - An amplifier made using an old HT-41 Hallicrafters Amplifier and adding the 160 meters band By W4NFR
      [ Hits: 572 | Votes: 1 | Rating: 7 ]
    • Dentron DTR-2000L restoration - The Dentron DTR2000L is an HF amplifier from the 1980 era. It uses a single 8877/3CX1500A7 tube to produce about a kilowatt of RF output. In this page NR7N includes info on operation, restoration and mods.
      [ Hits: 397 | Votes: 4 | Rating: 9.75 ]
    • Dentron GLA-1000 Conversion - Dentron GLA-1000 Conversion, modification with 4 PL/EL-519 or 2 GI-7B
      [ Hits: 1443 | Votes: 2 | Rating: 4.5 ]
    • Dentron MLA-2500 Retrofit to the GI-7B - How retrofit the MLA-2500 with the Russian GI-7B tube to replace the 8875's which are both expensive and hard to come by tubes by W4EMF
      [ Hits: 1715 | Votes: 1 | Rating: 5 ]
    • Easy Kilowatt Linear Amplifier - Rf amplifier for hf ham radio service - includes easy to understand designs and penny-cheap construction details
      [ Hits: 22250 | Votes: 17 | Rating: 5.53 ]
    • FC-80B Linear Amplifier - An AL-80B Copy - A Home brew 3-500Z HF Linear Amplifier heavily based on the Ameritron AL-80B
      [ Hits: 114 | Votes: 0 | Rating: 0 ]
    • FT817 Amp Project - How to build a lightweight amplifier that can be backpacked around.
      [ Hits: 1052 | Votes: 1 | Rating: 1 ]
    • G3YXM 500 W PA - 40-80-160 meter band linear amplifier
      [ Hits: 3502 | Votes: 3 | Rating: 7 ]
    • GS-35B Tube Amp - 160-10 Meters 1500 Watt Amp - W4NFR
      [ Hits: 440 | Votes: 2 | Rating: 9.5 ]
    • Heathkit SB-220 - The Heathkit SB-220, two 3-500Z, amplifier made a notable impact in the world of amateur radio when it debuted in 1975. Resources and modifications
      [ Hits: 3603 | Votes: 1 | Rating: 1 ]
    • Henry 2KD-5 Grade UP Modification
      [ Hits: 2312 | Votes: 8 | Rating: 7.62 ]
    • HF 1 KW Home Made Amplifier - Topic regarding a new 1KW HF power amplifier with 2x GI7B
      [ Hits: 1288 | Votes: 2 | Rating: 5.5 ]
    • HF Amp Project - This is the HF Packer amplifier project. KG9E was able to build this amp and put it on the air in about 25 hours.
      [ Hits: 852 | Votes: 3 | Rating: 7 ]
    • HF Power Amplifier by CT1FMS - An RF power Amplifier for HF bands with 3 GI-7B tubes by CT1FMS
      [ Hits: 1545 | Votes: 4 | Rating: 6.25 ]
    • HF power amplifier using GI7B - Gi7b is tube designed for microwaves but working good as HF amplifier. Idea is to build cheap, reliable HF amplifier covering 160 meters band.
      [ Hits: 3782 | Votes: 9 | Rating: 4.33 ]
    • HF QRP Lin Ampl - HF QRP Linear Amplifier with 2x 2SC2166 + 2x 2SC1969 Push Pull Transistors (13.8V)
      [ Hits: 4467 | Votes: 6 | Rating: 4.17 ]
    • HF Tetrode Linear Amplifiers - I4FAF etrode Tube Linear Amplifier experience
      [ Hits: 3425 | Votes: 1 | Rating: 10 ]
    • Home Made 2.4 kW HF Amp - A Solid State HF Amplifier with 16 mrf150 featuring 2.4 kW 1.8 MHz - 30 MHz
      [ Hits: 1338 | Votes: 3 | Rating: 7.67 ]
    • Home Made 813 Amp - An home made RF Amplifier project that allows near full power output from 813 tubes
      [ Hits: 1231 | Votes: 2 | Rating: 6 ]
    • Homebrew HF Amp with 3CX3000F7 - Grounded grid triode HF linear amplifier with pictures and schematics diagrams by W2DTC. The amp design was for 160 80 40 and 20 meters
      [ Hits: 3075 | Votes: 8 | Rating: 5.87 ]
    • Homebrew 813 Linear Amplifier - 813 Linear Amplifier Project includes many schematics, drawind and assembling construction
      [ Hits: 16994 | Votes: 14 | Rating: 8.13 ]
    • Homebrew a HF Power Amplifier - HF power amplifier project by YB0AH
      [ Hits: 2850 | Votes: 0 | Rating: 0 ]
    • Homebrewing a tube-type HF amp. - This article discuss the use and construction of a grounded-grid, triode type HF amplifiers
      [ Hits: 1754 | Votes: 0 | Rating: 0 ]
    • How modify a CB linear to use in HF band  pop - how to modify a Cb linear amplifier to use in HAm HF band
      [ Hits: 33833 | Votes: 104 | Rating: 6.44 ]
    • I5UXJ home made amplifiers - Infomration schematics and pictures about various hf and vhf QRO linear amplifiers
      [ Hits: 5128 | Votes: 6 | Rating: 5.5 ]
    • IK5MEN HF amplifier 10-160m. - Italian page including pictures schematics diagrams of an home made linear amplifier using four EL509 in parallel. Output power is about 700W.
      [ Hits: 4841 | Votes: 6 | Rating: 3.5 ]
    • Improving The Heathkit SB-200 - A QST article, hints and kinks on improving the SB-200 amplifier
      [ Hits: 2500 | Votes: 1 | Rating: 1 ]
    • K0GKD Solid State amplifier - High Power Solid State 600 Watts Output Motorola MRF 150 FETs
      [ Hits: 4731 | Votes: 14 | Rating: 7.79 ]
    • KENWOOD TL-922 Modifications - Allow 9 bands and 1300 Watt output on the TL-922 amplifier with this document by PA0FRI
      [ Hits: 2763 | Votes: 9 | Rating: 3.89 ]
    • L4b 160m Mod - L4B by Drake amplifier mod
      [ Hits: 415 | Votes: 1 | Rating: 5 ]
    • LA7MI 40W RF Amplifier for 80m - 40W Linear Power amplifier with FETs for 80m Some notes about saturation in ferrite- and iron-cores. Written by LA7MI Stein Torp, N-5005 Bergen
      [ Hits: 2835 | Votes: 2 | Rating: 1.5 ]
    • Modifications to the Ameritron AL-1200 Amplifier - This page describes two modifications W8WWV made to his AL-1200 amplifier. The mods were obtained from Ameritron, so they are official.
      [ Hits: 2843 | Votes: 4 | Rating: 2.75 ]
    • MOSFET amplifier for 80 mt. - Picture index of 150W MOSFET linear amplifier for 80m 1996, includes photos and schematics
      [ Hits: 17652 | Votes: 21 | Rating: 4.67 ]
    • N1IBC Eimac 4CX1500B HF Power Amplifier - 1500 Watt HF power amplifier
      [ Hits: 4859 | Votes: 6 | Rating: 3.83 ]
    • N4ATS.com - N4ATS - Devoted to the Yaesu FL-7000 Amplifier. I have been rebuilding, repairing, and applying modifications to the Yaesu FL-7000 amplifier for 15 years. Over 200 units completed and counting!
      [ Hits: 2060 | Votes: 3 | Rating: 9.33 ]
    • N4IP HF and 6 Meters amplifier - A solid state amplifier for HF and 6 meters band by N4IP
      [ Hits: 10134 | Votes: 5 | Rating: 9 ]
    • Power Amplifier using 4CX1500B - 4CX1500B RF amplifier schematic, working 1.8 MHz to 29.7 MHz
      [ Hits: 748 | Votes: 2 | Rating: 8.5 ]
    • QRP Amplifier - HF Bands QRP linear amplifier by SM0VPO
      [ Hits: 15094 | Votes: 13 | Rating: 7.85 ]
    • Reparing a Heathkit SB-101 - A document describing the reparing and restoration of an old Heathkit SB-101 power amplifier
      [ Hits: 160 | Votes: 0 | Rating: 0 ]
    • Restoring an Harris RF-103 - These amps are designed to operate from 2.0 to 30MHz continuously, at an RF power output level of 1Kw, in any mode, no time limit.
      [ Hits: 1446 | Votes: 1 | Rating: 10 ]
    • Russian amplifier for 160 and 6 meters - by Tony I0JX
      [ Hits: 4547 | Votes: 2 | Rating: 9 ]
    • SB-200 Amplifier Rebuild Notes - Robert Norgards KL7FM's, notes on upgrading the Heathkit SB-200
      [ Hits: 1511 | Votes: 1 | Rating: 4 ]
    • Stone Creek Special 600 HF RF Amplifier - This is a Solid State Amplifier Project. It uses 4 MRF150 MosFet Power Transistors. The Power Supply Voltage is 50 VDC at 21.5 Amp. The max power available is 1,075 Watts. The Efficiency is about 65% +/- and runs Class AB Solid State.
      [ Hits: 126 | Votes: 0 | Rating: 0 ]
    • Ten-Tec Centurion Mod - Ten Tec Centurion Mo-Mods by Bob Hutchinson, N5CNN
      [ Hits: 382 | Votes: 0 | Rating: 0 ]
    • The G2DAF Linear Amplifier - Scans of original G2DAF articles on his HF linear amplifier using QY3-125 tube
      [ Hits: 1524 | Votes: 5 | Rating: 3 ]
    • The IC-4KL HF Amplifier - The IC-4KL HF solid-state 1kW amplifier, product review and maintenance by KK5DR
      [ Hits: 1133 | Votes: 0 | Rating: 0 ]
    • The Two Module, 400 Watt RF Amplifier 80 Meters - This Class E RF amplifier will deliver up to 400 watts of RF output
      [ Hits: 647 | Votes: 0 | Rating: 0 ]
    • Using the Heath SB-200 Linear on Six Meters - Improvements to Using the Heath SB-200 Linear on Six Meters by Ron Klimas, WZ1V
      [ Hits: 2626 | Votes: 5 | Rating: 4.2 ]
    • VE6FI 4-1000a amplifier - 15-160 meters HF power amplifier
      [ Hits: 3154 | Votes: 4 | Rating: 9.25 ]
    • W2DTC Homebew RF Amplifier - Grounded grid, Cathode driven, 3CX3000F7 Triodes
      [ Hits: 2000 | Votes: 3 | Rating: 6.33 ]
    • WA2EBY HF amplifier - Revisiting the WA2EBY broadband HF amplifier
      [ Hits: 2379 | Votes: 2 | Rating: 7 ]
    • Yaesu VL-1000 amplifier - The Yaesu VL-1000 Quadra HF Linear amplifier
      [ Hits: 11037 | Votes: 5 | Rating: 6.2 ]
    • YC156 Conversion - RF Amplifier project modified the original chassis to use a 4CX1000A instead of a YC156 triode
      [ Hits: 1198 | Votes: 1 | Rating: 6 ]
    • Yet Another Amp for the 817 - An HF 10-20m portable RF power amplifier based on the RD16HHF1 FETS giving 25 W.
      [ Hits: 444 | Votes: 0 | Rating: 0 ]
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