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Message: <blockquote data-quote="corona56" data-source="post: 161253" data-attributes="member: 4309"><p>I own a Syn-1 with a Friedman BE two channel module.  I mostly use the blue channel with max gain.  Recently I switched to the RED channel and there is no sound.  I switched out the module with another I own and both channels work.   I wasn't sure how the pre-amp tube layout works so I tried switching in a different pre-amp tube in each position; no change.   Any layout diagrams or debugging techniques available for someone pretty well versed in circuit repair?  I am pretty blind as to whether one ribbon cable per channel etc. etc.  Thanks.</p></blockquote><p></p>