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Original Message
RE: Dunno about that
Posted by akolegov on January 7, 2017 at 02:24:48:
I used GE 6550s from time to time in Cary SLI-80, then put them into storage, and when I installed them again later, one of them produced hum (GE 6550). I threw it away yesterday.
One of VT-231s was probably faulty from the start, though I am sure that the seller tested all of them before shipment.