Subject: Re: [PolySix] Voice # 6 not staying in tune !!
From: Bob Grieb <bobgrieb@yahoo.com> Date: 2014-10-08
Hi,
Looking at the schematic, demux IC31 (4051B) might be a
good place to start. Probably next I would replace buffer
op amp IC37. Also, the two tune trim pots might be worth
changing out. Consider replacing them with muti-turn trimmers
which are cheap these days and more stable.
If you still have the problem, it starts to get into components
that seem to me less likely to fail, so I would do those first.
Let us know how it goes. Also, you need to make sure the circuit
board is clean in this area, as flux could also cause drift.
Bob
From: "jamieantonelli1978@yahoo.com [PolySix]" <PolySix@yahoogroups.com> To: PolySix@yahoogroups.com Sent: Wednesday, October 8, 2014 1:12 PM Subject: [PolySix] Voice # 6 not staying in tune !!
Voice #6 not staying in tune after full calibration multiple times with 3 different repair shops. I'm at my wit send with this unit. It's in great condition and if I could fix this problem it would be a mint machine. Please help!