There is an excellent stage by stage troubleshooting video on YouTube by a gentleman who uses the call sign NA5Y and that guidance got me this far. I can see gate signals like those in his video - but the waveforms at the drains of the transistors, and the waveform at the output of T3, don't resemble what he demonstrated.? The LPF filter is doing a good job of cleaning up the horrible harmonics visible at the output of T3, but in doing so I'm losing a lot of power.
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I've never built an RF power amplifier before.? As others have commented, shotgun replacing of parts is hard on the printed circuit board, so before I load the parts cannon I hope to get some insight as to where these unwanted harmonics are coming from.
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Bill
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