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  • #4116
    engineer
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    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

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