Vintage Synth Repair

Re: Crumar Trilogy repair

It is not a normal ground loop problem. The hum seems to be directly related to
the number of voice cards in the machine. So I think, the power supply could be
the problem.

I think, a recapping of the power supply should be the way to go.

On the other hand, there is a tantalum on every voice card. I think, changing
the tantalums on the voice cards shouldn´t be a bad choice either.

Anybody of you got some spare CEM´s?
One 3330 and a 3320 as well are broken. For one of my other machines I´m also looking for a CEM3340.



--- In vintagesynthrepair@yahoogroups.com, "Scott" <painintheamp@...> wrote:
>
> 
> 
> -If you can take the "ground loop" out of the equation, the most likely cause is power supply filtering capacitors that have gone dry  and arent doing what theyre supposed to.
> 
> I see this as a regular thing here in my shop.
> 
> Caps are easy to get and fairly cheap and replacing them drops troubleshooting time way down
> 
> Just doing that may make your troubles flee
> 
> Scott in Burrrrrrrr-mont
>