First of all: check if the the bus cable connectors are installed correctly.
E.g. if only +12V or -12V are applied clipping will occur. Otherwise it
sounds like a defective A-138b. There is only one cheap integrated circuit
on the pc board (TL062 for version 1, LM324 for version 2) that has to be
replaced to solve the problem. I cannot imagine that anything else could
cause the fault.

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto: Doepfer_a100@yahoogroups.com ]Im Auftrag von untiedstates
> Gesendet: Samstag, 7. Oktober 2006 03:09
> An: Doepfer_a100@yahoogroups.com
> Betreff: 1 A138 mixer distortion issue
>
>
> I have an A-138 exponential (audio) mixer and it seems to be clipping
> any signal I put into it at any level setting - I A/B-ed it with the
> A-138 polarizing mixer I have which is very clean in comparison.
>
> I can't tell if this just happened recently or has been like this.
>
> A couple things: I've been using headphones with the mixer, and
> sometimes have clipped signals on purpose for effect (it seems to clip
> standard levels if it goes over 7)
>
> Anyone ever have this kind of problem and any solutions - or is my
> mixer just fried
>
> thanks - bryan
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> Yahoo! Groups Links
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