Doepfer

Your idea seems rather more complicated than Dieter's - and in either 
case we would void the warranty. I wonder if there's a way to do it 
without losing the warranty - Does Dieter offer any kind of a 
modification service where the warranty would still be okay ?
I've done similar things before (modifying four of An.Sol's 
sequencers by installing a rotary switch to select the length of 
sequence, from 1 thru 8 events, and other stuff), so I think this 
wouldn't be a problem. It's just that my mixers are brand new.+
Thanks for the advice.
Richard

--- In Doepfer_a100@yahoogroups.com, Florian Anwander 
<Florian.Anwander@c...> wrote:
> Hi Richard
> 
> > Is it possible to couple together two Doepfer A138 mixers to give 
me 
> > eight inputs ?
> > Anyone know if this is possible ? 
> another suggestion (as potential alternative to Dieters 
instruction):
> 
> I have the output potentiometer always set fully clockwise. In 
other 
> words: I do not really need it.
> 
> So why not
> - replace the poti electrically by fixed resistors
> - mount a socket to the hole where the poti was mounted
> - connect this socket with a fixed resistor pot and resistor
>    to the central mixing point of the mixer.
> 
> I do not know the real potentiometer and resistor values at the 
moment, 
> but try these.
> 
> Oldinputs O--+
>               P      100k
>           50k P<-----rrrrr---+
>               P              |
>               |              |
>              Gnd             |
>                              |
>                              |
> Oldinputs O--+              |
>               P      100k    |
>           50k P<-----rrrrr---+
>               P              |
>               |              |
>              Gnd             |
>                              |
>                              |
> Oldinputs O--+              |
>               P      100k    |
>           50k P<-----rrrrr---+-----To summing amps
>               P              |
>               |              |
>              Gnd             |
>                              |
>                              |
> Oldinputs O--+              |
>               P      100k    |
>           50k P<-----rrrrr---+
>               P              |
>               |              |
>              Gnd             |      existing mixer
> ............................|........................
>                      100k    |      new input
> New Input O--+------rrrrr---+
>               |
>               r
>               r 47k
>               r
>               |
>               r
>               r 3k3
>               r
>               |
>              Gnd
> 
> 
> So you would get a fifth input with fixed amplification, which can 
be 
> used as for stacking mixers.
> 
> Florian