I have a MP-3 which has recently lost all signal output through one channel for the Main (phono) input. Aux 1 & 2 work fine. On the Aux channels the sound is equal on both channels. On the Main one channel sounds fine and the other is silent. Would appreciate thoughts on the best troubleshooting approach i.e. what should I look at first. The tubes have less than 100 hours on them. Was all working great last week and the problem manifested itself when I turned the preamp on yesterday. I appreciate any help given.
Thanks
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Topic - MP-3 - jumpsturdy 11:12:42 12/15/11 (14)