Vintage Synth Repair

Hi,
  I posted this at the odysseypatch group also. Can someone that has
an Odyssey please provide some info:

  I installed one of the new sliders from synthfool and it feels
great! I replaced the osc. 2 PW Mod slider. I can't recall (such an
idiot) its previous behavior though. When I have the switch under the
Mod slider set to ADSR the sound goes away when you raise the slider
all the way up. Is this normal? Osc 1 doesn't do this. Also, the LFO
switch setting seems to operate normally. FYI-I did adjust the 50% PW
trimmer to thin it out some at the max. slider setting but this
pertains to the other (50%-Min) slider under osc. 2 PW.

This is a Mk-I 2800 whiteface. I hope I've provided enough info here.

regards,

dizz

Hi, dizz

On my white-face, both oscillators behave the same, ie., neither of
them "disappear" when the ADSR PW mod is selected.  If it's just Osc 2
that is the problem, I suspect that it's because of the 50% adjustment
you set.  Think about it: if you set a thin pulse to start and then
modulation it with a non-cyclical wave, it might go to 0%.  It's
possible that it doesn't seem to disappear with the LFO modulation on
because the LFO is cyclical and keeps reappearing.

Try re-setting the 50% adjustment for Osc 2, and also check to see
that the LFO/ADSR select switch isn't dirty.  It may be that the
process of replacing the nearby slider may have knocked a bit of dirt
into the switch.

I've got three sliders with broken stems that I should replace on mine.

Bingo! You're exactly correct. I didn't even think to check the PW mod slider
when setting the 50% trimmer. I've matched it as close as possible by ear to
the osc. 1 behavior, which I believe is fairly well calibrated. I really need
an O-scope to do this properly but all I have is an earscope ;) All 
seems well.

many thanks,

dizz

Quoting balderson04 <djacklin@...>:

> Hi, dizz
>
> On my white-face, both oscillators behave the same, ie., neither of
> them "disappear" when the ADSR PW mod is selected.  If it's just Osc 2
> that is the problem, I suspect that it's because of the 50% adjustment
> you set.  Think about it: if you set a thin pulse to start and then
> modulation it with a non-cyclical wave, it might go to 0%.  It's
> possible that it doesn't seem to disappear with the LFO modulation on
> because the LFO is cyclical and keeps reappearing.
>
> Try re-setting the 50% adjustment for Osc 2, and also check to see
> that the LFO/ADSR select switch isn't dirty.  It may be that the
> process of replacing the nearby slider may have knocked a bit of dirt
> into the switch.
>
> I've got three sliders with broken stems that I should replace on mine.
>
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> Yahoo! Groups Links
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