The 300B tube on (one of) my Cary 300B amplifiers goes dead after a few months' listening. There's no sign of burning (tube glows red), just eventually losing sound. It usually startsn when I notice what I think is a "phasing" problem from my speakers. Then one day, when I turn on my system, one side has no sound coming out of it (always on the same amp). Before I run out of money trying to replace 300B tubes on a regular basis (and the tube is not cheap), I thought I'd post it here to see if anyone out there is having the same problem, and if someone can offer some clue as to what is wrong with the amp. Thank you.
nl393a
nl393a