Hi all,
I built my TU-8600S last year and all voltage specs were at or within +-5% of reference, with the exception of TP3, 4, 9, and 10 (I'm no genius with schematics but those appear to be the plate outputs). Those are about 10% below their reference points (95v vs reference of 110v for PT3 and 4, 165v vs reference of 175v for PT9 and 10). The amp sounds great, tubes heat up as expected, no issues with red plating. It's been about a year and I checked them again this weekend after rolling some new coupling caps and replacing the cathode output caps with the same spec but higher quality. Still measuring the same voltages, so no change. Is anyone else seeing the same measurements? Is this variable based on with 12ax7/12au7s I'm using? Anything I should be concerned about?
I built my TU-8600S last year and all voltage specs were at or within +-5% of reference, with the exception of TP3, 4, 9, and 10 (I'm no genius with schematics but those appear to be the plate outputs). Those are about 10% below their reference points (95v vs reference of 110v for PT3 and 4, 165v vs reference of 175v for PT9 and 10). The amp sounds great, tubes heat up as expected, no issues with red plating. It's been about a year and I checked them again this weekend after rolling some new coupling caps and replacing the cathode output caps with the same spec but higher quality. Still measuring the same voltages, so no change. Is anyone else seeing the same measurements? Is this variable based on with 12ax7/12au7s I'm using? Anything I should be concerned about?
