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Noisy tube amp

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confused:
I spent the day with a buddy working on my Akai amps.  1 amp has an intermittent noise, just a little background clicking.  This is unaffected by the volume control.  After the amp has run for several hours the noise stops.

We checked all tubes, coupling & power supply caps, amd bias resistors.  Moved components around to check for cold solders and cleaned switches and tube sockets.  The noise persists!

Anyone out there have any suggestions about whewre to look next?

THX for any suggestions?

OCCD:
Did you run the tubes from the good amp into the suspect amp? That is a good place to start the elimination process. That is unless you have already done that.

F1nut:
Even though you checked them, I would suspect a cap or possibly a tube going south, but more so, a cap.

confused:
Thanks F1nut & OCCD for the suggestions.  Tubes were traded right to left, noise did not move.  Also we physically removed the Caps And Resistors and temporarily replaced them to no avail.  Using a scope we were able to find the noise on 1 side of a resistor in the bias voltage divider, but not the other!  Replacing that resistor did not fix it. 

F1nut:

--- Quote from: confused on January 06, 2010, 06:00:28 PM ---Thanks F1nut & OCCD for the suggestions.  Tubes were traded right to left, noise did not move.  Also we physically removed the Caps And Resistors and temporarily replaced them to no avail.  Using a scope we were able to find the noise on 1 side of a resistor in the bias voltage divider, but not the other!  Replacing that resistor did not fix it. 

--- End quote ---

Hmmm....in that case, good luck!

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