I have a Marshall JCM 2000 DSL100 where just barely turning up the Reverb in either Ch 1 or Ch 2, the Reverb is feeding back LOUDLY. Swapped cables, change in sensitivity, but still squeals. I replaced the switching op amp M5201, no difference. Checked the MPS A13, it's fine. Checked the connectors. Conn 1 on the Reverb assy 10-63-02 comes from JCM2-60-00 Conn 8. Output Conn 2 goes to JCM2-61-00 Conn 8. Conn 3 from Reverb board goes to Conn 4 on rear panel PCB JCM2-62-00. Pedal makes no difference.
I haven't yet replaced the LM348 Quad op amp that drives the tank.
I don't recall coming across this problem before. The first tank that was installed RMOD-4BB3C1D did the same thing, though it had one of its' two decay springs broken. Just received the new replacement, and it does the same thing.
I haven't yet replaced the LM348 Quad op amp that drives the tank.
I don't recall coming across this problem before. The first tank that was installed RMOD-4BB3C1D did the same thing, though it had one of its' two decay springs broken. Just received the new replacement, and it does the same thing.
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