A Heathkit FM3A tuner is the present challenge… had it a while and thought I had fixed it last year. Now it won’t work, again! Realigned IFT’s and ratio detector transformer (as before.) Now it looks like the oscillator is very weak, only -0.6 volts on grid, but the 6U8 test good. BTW, I did not build this one, rather it was inherited with a number of radios, but the build quality seems good and it is very clean after all these years.
More forensics scheduled…
Cheers,
Roger