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One weird thing I've been seeing lately is a really high failure rate of TL074s and 84s... They seem OK but they have just enough offset to make things like tuning go bad. They have been in the OBX and OBXA... Very strange to me...
Yeah, mine were out of whack as well. Replaced all the socketed ones... they're cheap! Solved a lot of minor but annoying imbalance issues.
Scott in Ohio