Hi all...I have been busy these past few days doing a re build on my old HF shack amplifier..I built this unit a few years ago to cover 80-10 meters but in all that time I only ever used it on 7mhz..As my building and wiring skills have improved I pulled out all the original wiring, grid protection circuits and the tuned input and pi output coils...I made up a completely new front panel..
I completely re wired the amplifier using my current style, and disposed of the grid protection circuits which I have found unnecessary with the Russian GI-7BT triodes...I made up a simple adjustable Pi input network and a new coil for the Pi output...
I started on Monday and finished today...Switched it on and all functions work perfectly..I havn't put any RF into it as yet as I am re vamping my shack...Needed a good cleanup..
The following pics are the old amplifier then the rest the finished overhaul..Enjoy..
I will now upload the re modeled amplifier..
Bob..VK3ZL..