Doepfer

Well what happened is you've shorted the negative rail to ground. Judging by your module dates I'm going to make the assumption you've got a doepfer linear PSU. It's more than likely you need a new LM337 regulator. You will also need a new piece of insulation to go between the regulator and heat sink. I built my own PSU without remembering to insulate the heat sink and the regulator blew immediately.

> On 23 Oct 2016, at 07:38, sj230962@gmail.com [Doepfer_a100] <Doepfer_a100@yahoogroups.com> wrote:
> 
> EDIT.....
> 
> 
> dismantled all of the modules from the monster base- issue is that there is no -12V getting to the 2 left hand side power boards...so its not a module problem (I should have checked the modules in a different case).
> 
> Question now moves onto why I have no -12V, but I do have +12V
>