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Weird spring reverb problem

PostPosted: Tue Apr 18, 2017 11:35 pm
by Text_Edifice
Hi all,

mid mix tonight my vesta-kaza spring reverb started humming and then feeding back with any input applied.

I don't really know where to start with troubleshooting as it looks like the unit feeds back when any signal is sent to the input (even if nothing's plugged in to the output). I think maybe something is oscillating (opamp maybe) but not sure.

Before I go swapping out components - has anyone had a similar problem / have any advice for trouble shooting?

Re: Weird spring reverb problem

PostPosted: Wed Apr 19, 2017 10:00 pm
by a.d.a.m. baby
is there a schematic around??

Re: Weird spring reverb problem

PostPosted: Thu Apr 20, 2017 8:52 am
by Text_Edifice
That's the problem, I can't find one. I think it might be an issue with grounding as the shield on the inputs feeds into the circuit (seemingly by design) for some reason. But I can't find a schematic to check where this might be occurring.

I think next step is to just replace the various caps and look for any blown resistors / diodes.