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Re: Finally got my OTL apart to check suspected bias shift in one channel

Posted by Tom Dawson (A) on October 29, 2004 at 09:59:26

In Reply to: Re: Finally got my OTL apart to check suspected bias shift in one channel posted by Legendre on October 28, 2004 at 14:08:46:

Thanks for responses. I tend to agree wrt the suggestion that the driver stage tube is the most likely culprit, and I plan to swap input & driver tubes between channels to isolate the problem before I rebuild the bias & offset adjustment circuits to make them externally adjustable this weekend. My OTL, btw, only has signal path capacitors for a couple of small value resistor bypasses in the DC level shifter and, in the feedback loops for phase margin compensation and to roll off to unity gain at DC.

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