Vintage Synth Repair

Thanks, I'll try that...


--- In vintagesynthrepair@yahoogroups.com, "Scott Nordlund" 
<gsn10@...> wrote:
>
> >I wonder if anyone could help with this one:
> >
> >On my OBXa, one voice card sound thinner than the others. When
> >playing high notes this is less noticable but as going down the
> >keyboard it goes and sound thinner, sort of like a high pass filter
> >(no low frequencies). I tried to replace the CEMs but it's not in
> >there...
> 
> 
> It's difficult or impossible for anyone without intimate knowledge 
of the 
> OBXa to suggest what to look for specifically.  What you need to 
think about 
> is how to most efficiently analyze and approach the problem.  I 
would 
> determine first if any parameters affect this by comparing 
pulsewidth, 
> cutoff, resonance, etc. between the voice cards.  Then maybe I'd 
compare 
> output waveforms or spectra for each voice to see if there's 
something more 
> quantifiable, and find the source of the problem by tracing the 
signal path. 
>   You probably don't even need an oscilloscope if you can use some 
sort of 
> "audio probe" that goes straight into your sound card.
> 
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