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  1. B

    Express 5:50 feeds back with no instrument plugged in.

    sure im using: 1 oclock gain, just before 1 oclock treble, 9 oclock mid, 11 oclock bass, 10 oclock reberb, 9 oclock master, 3 oclock contour clean channel then my mosfet pedal has a volume I use to control everything. I have no volume issues, are your power tubes ok?
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    Express 5:50 feeds back with no instrument plugged in.

    cool, well I got my FullTone mosfet. ****, tone heaven. What a sweet pedal. Sounds great in to the clean channel of the mesa express. PLaying a strat deluxe with s1 swtiching and Samarium Cobalt Noiseless™ Strat® Pickups into the fulltone mosfet->clean channel. I'm very happy with this setup. :D
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    Express 5:50 feeds back with no instrument plugged in.

    Thanks guys, yeah 5,6,7 o'clock It ended up being the tubes, but they were only 2 months old. diagnosis was "multiple microphonic tubes" It threw me off because I followed the instructions in the manual to troubleshoot bad tubes by swappping out 12ax7's one by one, etc...Also the manual...
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    Express 5:50 feeds back with no instrument plugged in.

    Hi - I've had the Express 5:50 for about two years and love it. I've recently retubed, and have a few extra brand new tubes laying around as well for troubleshooting. The problem I'm having is with no instrument plugged in,when I put the amp on and put the gain and master up to around 4-5, the...
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