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Old 13th Oct 2019, 7:33 pm   #10
ben
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Join Date: Aug 2006
Location: Madrid, Spain / Wirral, UK
Posts: 7,498
Default Re: Reel to reel valved tape recorder Geloso G258, problem

Might it also be the case that the selenium rectifier(s) are also leaky? If the voltage falls then the bias oscillator will certainly misbehave.
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