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Recently, I have noticed some deep purr coming from the bright channel of my 1987 clone. When the volume is say above 7 8, that purr gets really noticeable. In fact, the headcab was vibrating a bit as well. Very tiny vibrations...
And I thought, ****! You know... Of course, the worst case scenario was the one I was afraid of, that the OT was vibrating...
But then I thought of all the advice that knowledgeable folk here is giving: First check the valves. Don't get me wrong, I can do tech stuff. But when it happens... I forgot all of those initially.
Opened up the cab. With a pencil, started checking the valves (touching, not hitting, each with this pencil while the amp is on, and hearing its effect).
So the TungSol 12AX7 (which I loved) was the one causing the vibrations... It was a lively bright valve... Yet, changed it with a JJ ECC83s that was lying around. And the purr and vibrations were gone instantly. I don't like its tone that much, but at least it is working!
Just wanted to share...
B
And I thought, ****! You know... Of course, the worst case scenario was the one I was afraid of, that the OT was vibrating...
But then I thought of all the advice that knowledgeable folk here is giving: First check the valves. Don't get me wrong, I can do tech stuff. But when it happens... I forgot all of those initially.
Opened up the cab. With a pencil, started checking the valves (touching, not hitting, each with this pencil while the amp is on, and hearing its effect).
So the TungSol 12AX7 (which I loved) was the one causing the vibrations... It was a lively bright valve... Yet, changed it with a JJ ECC83s that was lying around. And the purr and vibrations were gone instantly. I don't like its tone that much, but at least it is working!
Just wanted to share...
B
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