Doepfer

Probably the transformer. PSU1s were prone to becoming noisy in this way in my experience

Jonathan Shapero
Sent from my iPhone

> On 11 Dec 2018, at 16:40, Diego Ragnini diegora@free.fr [Doepfer_a100] <Doepfer_a100@yahoogroups.com> wrote:
> 
> 
> 
> What is the module concerned by this sound output? The one you hear the sound from, I mean… Or just any module featuring an audio output jack?
> 
> 
>> Il giorno 11 dic 2018, alle ore 17:33, kazys varnelis kvarnelis@gmail.com [Doepfer_a100] <Doepfer_a100@yahoogroups.com> ha scritto:
>> 
>> 
>> Hi I have a P-9 that makes a high pitched sound at the edge of my hearing (12-13000Hz or so). I have three others, none of them make it. It decreases as I unplug modules, but with half of them unplugged, it is still faint. It doesn't appear to be any module in particular. The bus board reads version 5/2008. 
>> 
>> Any thoughts? 
>> 
> 
> 
> 
>