Musicman RD-100 Head reverb problem
Musicman RD-100 Head reverb problem |
Music Man Amps Discussion Forum » Reverb Spring ("Tank") » Musicman RD-100 Head reverb problem
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Brad Gregory (bdgregory) Username: bdgregory Registered: 07-2010 |
A guy I know has this RD-100 head and the Reverb stopped working. I ran the diagnostic procedure I found on this site and with the cable connected between the 2 RCA connectors there is a high pitched squeal when the reverb volume is turned up. I assume this indicates a problem in the reverb circuit. I have a couple of questions I hope someone can help with: |
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Lars Verholt (lmv) Username: lmv Registered: 11-2009 |
The RD-100 came in three different (at least) versions, so you may have a different schematic compared to the actual amp. Have you tried feeding signal to the reverb return RCA jack from, say, an mp3 player? If that works (it won't be hi-fi of course) next step is to pull signal from the reverb send RCA jack and feed it to another amp (stereo, computah). This signal will be pretty strong so don't turn up the volume control too high. |
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Brad Gregory (bdgregory) Username: bdgregory Registered: 07-2010 |
thanks, I have only found 2 different versions of the board. Neither appears to match though one of them is using the correct op amps. Also, the diagnostic I ran essentially performs the routine you suggest, though what you suggest may help pinpoint if the issue is with the output or return if not both. |
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Brad Gregory (bdgregory) Username: bdgregory Registered: 07-2010 |
thanks again for your assistance Lars - I finally broke the code. The correct schematic was the last one - with 6L6 tubes . . . and it helps if you're looking at the correct part of the board when you're trying to match up to the schematic. |