Any issue with a tube in my tubed hifi rig or guitar amps becomes grounds for dismissal. Having use tubes for over 50 years I've been amazed at how rare issues with bad tubes have been, but when they have become noisy or lose their sonic charms in any manner, they're OUTTA HERE.
tube noise - 2 questions
Q1: Three months ago, I installed two matching NOS 6DJ8’s in my preamp. Sounded great up until a week ago. Barely audible tube rush on startup - and then totally quiet. Three months later, one started making crackling noises. Only intermittently. It will crackle for a few minutes - then all is well again for days. But, this repeats every so often. Does this intermittent problem mean that tube is soon to be history?
Q2: With a different preamp, a NOS 12AU7 had crackling & popping noises from the get-go. The noise never went away - even after 100 hours of burn-in. I tried the same tube in my DAC, zero noise - ever. Why might that be?
Q2: With a different preamp, a NOS 12AU7 had crackling & popping noises from the get-go. The noise never went away - even after 100 hours of burn-in. I tried the same tube in my DAC, zero noise - ever. Why might that be?