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Modified 54C - Oscillator Issue
#3

Steve,

Thank you for responding.

I did not attempt to operate the radio in its "as is" state. It had been "restored" by someone but they did a very poor, sloppy job and I opted to not even try it.

I have done this octal conversion before, on a 38-14, and had no issues whatsoever.

Just for fun, I tried different capacitors in parallel with the oscillator section of the tuning capacitor. Using a 150 pF put me in the ballpark as far as getting the tracking correct is concerned. 180pF also worked but was a bit too much. This is why I was thinking perhaps something about the oscillator coil's characteristics has changed.

I'm baking the oscillator coil now, and I may try a different 12A8GT. I currently have a tested used tube in that socket. i do have a few NOS 12A8GTs. As you say, the characteristics of both it and the 6A7 are very similar.

--
Ron Ramirez
Ferdinand IN


Messages In This Thread
Modified 54C - Oscillator Issue - by Ron Ramirez - 11-20-2021, 10:59 PM
RE: Modified 54C - Oscillator Issue - by Ron Ramirez - 11-21-2021, 11:52 AM
RE: Modified 54C - Oscillator Issue - by OZ4 - 11-21-2021, 12:12 PM
RE: Modified 54C - Oscillator Issue - by OZ4 - 11-21-2021, 12:26 PM
RE: Modified 54C - Oscillator Issue - by MrFixr55 - 11-21-2021, 04:12 PM
RE: Modified 54C - Oscillator Issue - by morzh - 11-21-2021, 05:10 PM



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