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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Follow Ups
- Re: Finally got my OTL apart to check suspected bias shift in one channel - Tom Dawson 09:59:26 10/29/04 (1)
- Updates - Tom Dawson 08:48:26 11/05/04 (0)
- Re: Finally got my OTL apart to check suspected bias shift in one channel - Tom Dawson 08:39:40 11/05/04 (0)
- Bias & Offset Circuits updated - Tom Dawson 09:02:02 11/04/04 (0)
- Re: Finally got my OTL apart to check suspected bias shift in one channel - Tom Dawson 13:39:10 11/03/04 (0)