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RE: Exchange tube across L & R channel, & hear. (nt)

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In Reply to: RE: Exchange tube across L & R channel, & hear. (nt) posted by cheap-Jack on November 19, 2007 at 11:36:51

If I move the corrupted left channel tube to the right channel socket, the right channel now displays distortion.

Follow Ups:

So the left channel tube is defective, replace it. (nt) - cheap-Jack 13:22:09 11/19/07 (3)
.
- RE: So the left channel tube is defective, replace it. (nt) - sept79 14:14:39 11/19/07 (2)
  How many times do I replace this tube in a three month period before I am to suspect that there is a problem other than a bad tube? As I indicated in the original post, I can't make it through a week before I have a corrupted left channel 6N1P tube. I probably am hearing distortion out of the left channel after 3 or 4 days.
  - If this has been a repeating fault,.. - cheap-Jack 12:50:51 11/20/07 (0)
    Hi.
    
    Could it be due to leaking I/P coupling or O/P coupling caps of the left tube amp stage?
    
    c-J
  - Check tubes' operating points. - sser2 19:03:08 11/19/07 (0)
    Measure DC voltages on plates and cathodes of L and R tubes. Calculate current and dissipated power. Power higher than 2 W per section may cause premature tube failure. The reason of out-of-spec operating point could be leaky coupling capacitor or shorted resistors connected to the section.

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