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Vintage Synth Repair

Index last updated: 2026-04-28 23:41 UTC

Message

Re: Roland SPV-355 PV synth module fault

2008-03-22 by duncan

>>The triggering side seems to be ok as you can make the self ocillating
> filter sound by playing a guitar into it or hooking up cv/gate. It has
> no relation to the pitch but then I dont expect the filter oscillation
> to react to pitch like the proper VCO's would.<<

it should. the filter should track perfectly if the generated CV is
doing anything. first thing to check is that the CV coming back out of
the box is 1v/oct like it otter be.
check all the power supply rails inside- you don't need to have the
schemos to discern a problem in this area, since this vintage of kit
will certainly have a rather basic linear psu, probably running
symmetrical + & - 15V or something in that neighbourhood, & possibly a
5V rail or two for any digital stuff in there.

hth-
duncan.

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