Johnson Viking II transmitter interstage transformer inverter tube module replacement live demo

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Ham radio Project: Replacement inverter system for the Johnson Viking transmitter line. If you own one of these vintage transmitters you may be aware of the audio interstage transformer failure. Hard to find and expensive. Plus being 60 years old, failure may be pending. So, I set out to design an alternative. Here it is! The tube inverter module. This is a drop in replacement. No mods needed. New boards have arrived. I have a decent quantity on hand. If your interested, drop me a line.