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Mizuho SG-9

Hallicrafters S20R

First QRP TX

6883B Linear

GE524 and GR345

300W HF amp


9851 DDS 

DDS and 16F628




Solid State 300W HF linear amplifier

This module is capable of giving an o/p of 300W and was probably a part of a commercial 1KW amp.

I got this module as a gift from a  good friend, VU2PEP, oldman 'Paddy' in Hyderabad few years back. A solid 100W is conveniently possible with a nominal input of less than 10W, making it very useful as the station 'QRO' for any homebrew  QRP.

The entire module is mounted on a (real heavy) heat sink. The only additional circuitry required are for a 15 to 20 Amp power supply and low pass filters for the band/s of interest.

I have only completed preliminary tests at low power on dummy load and it looks promising. Since the schematics were not available, I've managed to trace the PCB & draw everything from scratch, though quite a few details are missing, I hope to complete it soon.

Eventually this linear is intended as a boot for my GE524 HF 'manpack'.