Re: Very odd fault with Dynatron Radiogram
You have probably investigated this - but back in the 70s I had a similar problem with a Rogers Ravensbourne amp - intermittent motorboating on the MM disc input. It turned out to be a cracked resistor in the phono stage. There were 4 sensitivity settings selectable by prodding combinations of 2 buttons. Prodding enthusiastically, of course, resulted in the problem disappearing temporarily!
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