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  1. M

    Whistling noise after retubing 50/50

    Installed new GT6L6CHP, problem solved!! 8) Thanks all for the suggestions!
  2. M

    Whistling noise after retubing 50/50

    All the tubes were glowing orange and appeared to be equally luminous. The whistling was not channel specific. The whistling sound was coming from within the chassis. The tube supplier has recommended I try GT 6L6CHP's and has shipped them to me. I should receive them next week, I'll report...
  3. M

    Whistling noise after retubing 50/50

    Not yet, would a bad preamp tube cause this to happen? The noise is louder on the front(control side) of the amp.
  4. M

    Whistling noise after retubing 50/50

    :? I recently installed a new matched quartet of JJ 6l6GC's in my 50/50 poweramp. 2-3 minutes post power up I could hear a high pitched whistling or whining coming from my power amp. It does not get louder with volume increase and stops when the amp is switched back to standby. It is still...
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