> Hi Doepfer team --
>
> My 6U Suitcase has recently started making a sound when any
> module is sent out to mixer or my 3U skiff. It's a small,
> higher-frequency white noise-ish kind of sound. I removed each
> module one by one to test to see if they were causing it, but it
> is definitely the suitcase.
>
> I do have an A-199 Spring Reverb module, and I know that they can
> sometimes cause noise, but I disconnected this module both from
> the power and pulled the RCAs from the tank. I did not go so far
> as to completely remove the tank and the cables from the suitcase though.
>
> I can upload a sample of the sound if it helps, but in the
> meantime, any suggestions as to what might be causing this It's
> very distressing, as it completely ruins the sound of my synthesiser.
>
> Cheers,
> Jon

If the sound was not present earlier I'm quite sure that you have changed
the type of wiring between the A-100 and the rest of your equipment
(including mains connections). If that's not the case maybe the power supply
is faulty and has to be repaired - but I don't think so.

Best wishes
Dieter Doepfer