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To answer the question from #8 yes it can. The ts4d has a stacked B+ setup so H-K leakage in v1,v4,v6,v11a could put the buzz in the sound those before mentioned tubes are between B++ and B+so anything in the B+ line will be affected. Best to check for hum on B+ line with a scope. Also failing selenium rectifiers can sometimes do that as well. Un bypassed silicon diodes also can add noise on B+ lines. If you don't have the Motorola factory manual you can get it at the ETF site. All the best,Tom
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