Rhodes Chroma Polaris

Yeah Paul it doesn't seem to do that... if you turn the voice off it goes to negative volts again.  But as soon as you hit a note the volume goes to zero and sets there indefinitely I think...  weird..

Anyway hopefully can figure the source of it here.  The 4051's made no difference.  Those caps never leak I'm sure and to have 3 paralell channels?  Odd.  Maybe I should just hose the whole board with chemtronics..might be a residue issue around the S_H 's

--- In chromapolaris@yahoogroups.com, "Paul D. DeRocco" <pderocco@...> wrote:
>
> > From: Robert Weigel
> > 
> > For some reason the other voices sound fine.  3 was the 
> > worst.  After cleaning things up a bit..now 2 is what three 
> > was. Oh and I swapped out the fast 4051 analog switch and op 
> > amp that drives the vca in. I was seeing a sawtooth there...  
> > leaky S+H I was thinking?   
> 
> Yup, that's what leakage looks like.
> 
> > Also 5 doesn't tune yet I can turn it back on and it sounds 
> > ok.  it's envelope is strange though. Sustains with that 
> > level at zero then turns off w/out it moving.  That makes no 
> > sense.  hmmm.  rechecking that..anyway if anyone has seen 
> > anything similar... I saw something kinda similar on a siel 
> > dk600 where it was that voltages were peaking on the DAC out 
> > higher than the reference voltage on 4051's.  I adjusted the 
> > dac though and...why would it be doing it on three and not 
> > the last three?
> 
> Not sure what you mean by "Sustains with that level at zero then turns off
> w/out it moving." However, I do recall that the volume envelope has a
> squelch so that when it gets to zero, it is suddenly driven negative, to
> kill any possible bleedthrough. When you do the Volume Offset adjustment
> (LF, A, 9), this squelching is suppressed so that you can hear if there's
> any residual offset. Unless you mean something completely different, I think
> you need to do the Volume Offset adjustment.
> 
> -- 
> 
> Ciao,               Paul D. DeRocco
> Paul                mailto:pderocco@...
>