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Post subject: 1983 Twin II Reverb Hum.
Posted: Mon Oct 06, 2008 11:26 am
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I have a Twin II, that gets a 60 cycle type hum, whenever the reverb is turned above 2.
The hum is present with the tank disconnected, with no pedal connected.
I have tried 2 different types of tube in the V5 position (incl JAN Phillips).
I have replaced the capacitors in the reverb cct.
I have checked all grounding.
The tube seems to produce noise when tapped.
Send and return level pots make no difference.
I am running out of ideas.

Any ideas, or assistance would be appreciated.

P.S I cannot find the chassis layout for this amp anywhere, if someone had one they are willing to share, that would be greatly appreciated.

Thanks in advance.


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Posted: Mon Oct 06, 2008 4:35 pm
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Have you tweaked the Hum Balance and Output Matching adjustment on the rear?

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Post subject:
Posted: Tue Oct 07, 2008 7:16 am
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Mike, I had discounted this as there is no other noise connected with any other controls or volume, purely reverb. But having said that, I intend to have a play this evening.
Thanks


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