HF Amplifiers

600 Watt HF Amplifier - Schematics plans by K9GDT and all infos to build a 600 Watt HF Amplifier

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

SP5GJN - HF Power Amplifiers - HF home meade power amplifiers by SP5GJN

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

G3YXM 500 W solid state amplifier - HF 500 Watt power amplifier schematics by G3YXM

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

Yaesu VL-1000 amplifier - The Yaesu VL-1000 Quadra HF Linear amplifier

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

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

100W HF QRO linear amplifier - Based on Motorola MRF454, schematics and component list

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

2 kW HF Amplifier Rebuild - Heathkit SB-220 amplifier repaired at W8UM

4-1000A Project HF Amplifier - An 80-10 meter band switchable HF amp using a 4-1000A

Dentron GLA-1000 Conversion - Dentron GLA-1000 Conversion, modification with 4 × PL/EL-519 or 2 × GI-7B

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

Frankenstein. Heavy duty single 3-500Z Amplifier - This project will be a single 3-500Z with a twist. This amp will run about 3600 volts on the anode which should allow for a full kilowatt with about 50 watts of drive. This amp cover 20,40,80 160 meters

G3YXM 500 W solid state amplifier - HF 500 Watt power amplifier schematics by G3YXM

G3YXM 500 W PA - 40-80-160 meter band linear amplifier

Granta Contest Group - HF amplifier - The Granta Contest Group was founded in 1997 by Mark G4AXX, Colin G4CWH, Simon G4EAG, Andy G4KNO. The Group gets it's name from the River Granta (or Cam), which passes through Cambridgeshire and Essex. Using is a 160-10m "desktop kilowatt" linear amplifier using an Eimac 4CX1000A tetrode

Grounded Grid Amplifier - Picture of a power amplifier, made using of GI-7B triodes by Bob Briggs, VK3ZL

GS-35b HF Power Amplifier - The amplifier described here is an update of the High Power linear amplifier described in the July, 1995 issue of the "Radiolubitel. KW i UKW" magazine in Belarus. In English, this is "Radio Amateur. HF and VHF". by Gary Podgorny, EW1MM

GS-35B Tube Amp - 160-10 Meters 1500 Watt Amp - W4NFR

Harris linear amplifiers mods  ^updated - Harris linear amplifiers RF-353 and RF-355, full automatic amplifiers, 1.6 to 30 MHz How to use them without the Harris transceiver RT-1446 by F1FRV

Heathkit SB-200 Modification - Tuned input circuit modification by Tom Boza - NE7X

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

Heathkit SB-220 and SB-221 essential mod - Modifications to avoid damage when 3-500Z tubes fail.

Henry 2KD-5 Grade UP Modification

HF Amplifier using 4-1000A - Homebrewing HF amplifier capable of doing the legal limit plus using a 4-1000A

HF Packer- Amp Project - 3rd Generation HF Packer-Amp home construction project

HF Power Amplifier by CT1FMS - An RF power Amplifier for HF bands with 3 GI-7B tubes by CT1FMS

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.

HF QRP Lin Ampl - HF QRP Linear Amplifier with 2x 2SC2166 + 2x 2SC1969 Push Pull Transistors (13.8V)

HF Tetrode Linear Amplifiers - I4FAF etrode Tube Linear Amplifier experience

High Power Solid State 600 Watts Amp - A power amplifier project by K0GKD based on Motorola MRF 150 FETs. This RF amplifier is capable of 600 Watts output include pictures, schematics and link to videos.

Hillar's Amp BTI LK-2000 Amplifier to gs35b - The BTI LK-2000 was originally a 3-1000z based amplifier, converted to a GS-35b.

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

Homebrew 813 Linear Amplifier - 813 Linear Amplifier Project includes many schematics, drawind and assembling construction

Homebrew a 3 Tube GI-7B-T HF Amplifier - Build a 3 tube, GI-7B-T amplifier using an old prototype box that was meant for 4, 572-B

Homebrew a HF Power Amplifier - HF power amplifier project by YB0AH

Homebrew HF Multiband Amplifier - Pictures of a homebrewed mono-band 80 meter 1 Kilowatt amplifier modified and extended to 10-80 bands

Homebrewing a tube-type HF amp. - This article discuss the use and construction of a grounded-grid, triode type HF amplifiers

I5UXJ home made amplifiers - Infomration schematics and pictures about various hf and vhf QRO linear amplifiers

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.

Improving Heathkit SB-220 - Circuit Improvements for the Heath SB-220 Amplifier

Improving The Heathkit SB-200 - A QST article, hints and kinks on improving the SB-200 amplifier

JA3MHV Amplifiers - 4CX1000A x2 AB1GG Power Amplifier, 21MHz 15W and 3.5/7MHz 20W SSB Transceiver by JA3MHV, 50/144/435MHz 80W Linear Amplifier

K0GKD Solid State amplifier - High Power Solid State 600 Watts Output Motorola MRF 150 FETs

KA5ROW's 922-A mods - My Shack, Cavanal Hill Worlds Highest hill and a 10 Meter mod for Kenwood 922-A

KENWOOD TL-922 Modifications - Allow 9 bands and 1300 Watt output on the TL-922 amplifier with this document by PA0FRI

Kenwood TL-922 Modifications - Pictures of some modifications to the Kenwood TL-922 HF power amplifier

L4b 160m Mod - L4B by Drake amplifier mod

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

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.

N1IBC Eimac 4CX1500B HF Power Amplifier - 1500 Watt HF power amplifier

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!

N4IP HF and 6 Meters amplifier - A solid state amplifier for HF and 6 meters band by N4IP

Old 813 homebrew Amp - Restore an old 813 homebrew Amp with power supply from recycled parts

ON7WJ Amplifier 1000 watt

ON7WJ Amplifier 500 watt

QRP Amplifier - HF Bands QRP linear amplifier by SM0VPO

Repairing an FL2000B linear amplifier - Restoring a Yaesu FL2000B amplifier by M0DGQ

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.

Russian amplifier for 160 and 6 meters - by Tony I0JX