Doepfer

> Hey all,
>
> My Doepfer A-199 spring module has suddenly started distorting. I've
> only had it two weeks, and I just got a lovely Accutronics 4 spring tray
> for it that sounds amazing. Then today, it sounded different, like the
> reverb signal was going through a fuzz pedal - so I backed the level
> off, and it kept happening, so I hooked up the original Belton tray, and
> the problem persisted. The dry signal going to it is fine, and turning
> the mix control fully left gives a normal dry signal. All I could think
> was that I had tugged the RCA cable inside the case and something had
> come loose - but everything looks fine.
>
> Does anyone have any suggestions? I'm gutted, I finally get the spring
> sound of my dreams, and now its gone again... :help:
>
> Any help gratefully received. I'll post this on the Doefper forum too,
> just in case.
>
> Cheers,
> TJ

The power amplifier of the A-199 that drives the reverb unit has no short
circuit protection as one assumes that it is internally connected. If you
made a short circuit with one of the RCA connectors to GND (e.g. case or
mounting rails) while the module was powered probably the power amplifier of
the module became defective and the LM386 amplifier circuit has to be
replaced. But that's only a guess (diagnosis from the distance is generally
uncertain). Please check also the bus connection of the module.

Best wishes
Dieter Doepfer