--- In tr-707@yahoogroups.com , "roglok" <roglok@...> wrote:

>
> hi everybody,
>
> i recently got a 707 with dead ride and crash cymbals. i took a look at the service manual and noticed that both voices share some components: There's IC25 (4013 Flip-Flop) and IC26 (5218 OP AMP)
>
> does anyone think it's likely that one of these components is failing or do you have any other ideas what could cause the dead voices
>
> thanks,
> roglok
>

Hi roglok,

Did you fix the issue with the mute ride and crash cymbals
I have a 707 with somewhat similar errors. On mine, however, it's the bassdrum, snaredrum and hi-hat sounds that are muted.
I'm working on it. I'm convinced that the error is to be found somewhere in the analog signal line after the DA-conversion. Most probably one or more leaking electrolytic caps.
Op-amps may also degenerate over time. After all the 707 is 25+ years old.
I'll keep you posted.

b_dk2001