Hi,
Just a couple of things of note. I had a problem with noise with the
MG in VCA mode. This was a sort of thumping sound and was caused by
processor port lines P24 being disconnected and the 4042 not clocking
through data in a sychronised manner. However, if the sound is real
white noise and a hisssssss then might I suggest you look at the
signal path running through KLM-368 in and around IC20/21. In order
to spot the parasitic oscillation you'll do well to find and use and
oscilloscope for this problem.
Good luck and festive fun to you.
Cheers,
Andy
--- In PolySix@yahoogroups.com, "wasteking1" <wasteking1@...> wrote:
>
> I finally got my klm-367 working again (it had been on the fritz )
and
> got the polysix all working and programmed but noticed that when i
set
> the three way modulation selector switch down to VCA i suddenly
heard
> a noticeable amount of white noise behind the desired sound. this
white
> noise is also affected by the mod-rate knob so that when the knob
set
> to any rate the noise pulses in the background when NO notes are
played
> and is a bit annoying. the other 2 positions of that switch vco
and
> vcf are quiet...no problems there , just the vca setting. any
ideas?
> if i can clean that up its running at 100% after a year in the
shop. (
> perhaps then time for that 'double your memory' mod?)
>