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I also have a Radiola 100A which I have tried with the AK 30.
The last time I was working on the radio I had some howling as I increased the volume, so I planned to revisit the grid resistors and the grid leak. I had increased the grid leak resistor to 4 Megohms, and I will try variations on that. After that, I'll try to figure out what to do with the C-. It's now at -4.5V.
Thanks
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Winky Dink
Damn the patina,
Full speed ahead!
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