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Post subject: Fender "The Twin" channel switching not working
Posted: Sun May 31, 2009 3:54 pm
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Joined: Sun May 31, 2009 3:49 pm
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Fender "The Twin" amp - red knob version.
http://www.schematicheaven.com/fenderamps/the_twin.pdf

Amp stuck in parallel mode. Can't switch channels by either footswitch or panel pull pot. Channel LEDs not lighting up either. (Both chanel LEDs should be lit in parallel mode).

Replaced all preamp tubes with new. Switched with know working tubes. Still can't find the problem.

All wiring seems to be correct and good.


Also, I can not get .4v on the bias circuit. The most I can get is .3v.


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