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Old 28th September 2013, 02:20 AM   #131
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I managed to swap the output transformers, and the gain-phase problem follows the iffy transformer. The solution for the time being will be to steal a UBT-1 from one of my other projects, bodge it in, and see if it fixes the issue. I already have yet another pair of UBT-1s coming courtesy of Fleabay (2 for the price of one!).
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Old 30th September 2013, 08:35 AM   #132
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New output transformer bodged in, will test soon - it would be nice to have two channels behaving the same way.
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Old 2nd October 2013, 08:39 PM   #133
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Sisyphus comes to mind.... I tested the channel with the replaced transformer on the gain-phase analyzer. The initial plot looked good, then that channel promptly promptly broke. Hopefully I can fix this (and have it stay fixed) in time for BA. It's an opportunity to re-center the bias on both channels and do some other maintentence things.
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