[sdiy] Octave Cat modulation weirdness

[Nicholas Keller]

I've always heard that the trimmers in the SRM are a source of trouble, but these would just make it unstable, not cause LFO bleed



> On Sep 30, 2015, at 2:46 PM, Travis Thatcher <recompas at gmail.com> wrote:
> 
> I didn't do a lot of soldering however I did clean my work with the
> rubbing alcohol. The odd thing is that VCO 1 has everything working as
> expected. The modulation switch works as well for VCO 2 - changing the
> modulation from sine to square to s&h.
> 
>> On Wed, Sep 30, 2015 at 2:04 PM,  <rsdio at audiobanshee.com> wrote:
>> Your description implies that you did some soldering. Did you clean the flux off the board afterwards? I'm not sure that flux could absorb humidity, but perhaps.
>> 
>> Brian
>> 
>> 
>>> On Sep 30, 2015, at 10:58 AM, Travis Thatcher <recompas at gmail.com> wrote:
>>> I recently restored an Octave Cat SRM and it was working pretty well.
>>> I replaced nearly all the CMOS and recapped somethings. The only thing
>>> I couldn't perfect was the scaling when you switched from mono to poly
>>> mode but that didn't bother me - just meant I had to adjust the tuning
>>> of osc1 by a step.
>>> 
>>> The weather here in central VA as well the rest of the Eastern US has
>>> been a bit humid to say the least. Yesterday I fired it up only to
>>> find that osc 2 is constantly getting an amount of modulation from the
>>> LFO, even with the modulation pot turned completely off. I checked and
>>> leg 1 of the pot still has continuity with ground. I'm guessing a cap
>>> some where finally bit the dust, maybe egged on a bit by the humidity
>>> in the house. Just curious if anyone has seen anything like this. I'm
>>> going to open it up tonight to investigate.
> 
> 
> 
> -- 
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