After many weeks refurbishing my "new" old Polysix I am very nearly there! I have one last issue before the final tune up and I wondered if anyone had any ideas. All knobs, switches and buttons on the synth work and do what they should. The KLM-367 board is a brand new clone with new clone CPU so I assuming that it is ok.
The issue is that when I turn the Polysix on from cold, the MG frequency is properly set as designated by the preset but "leaks through" at a higher level than the preset's actual values causing a significant wobble in the tone. This happens even when changing presets.Turning the MG frequency and MG level controls to 0 will not entirely eliminate this. At the same time, the arpeggiator pulse leaks into the tone causing "catches" in the tone that can be varied by turning the Arp Speed control. However, all these issues gradually fade as the synth warms up and after a minute or two and the synth works perfectly. On switching the synth off and on again when warm there is a slight MG wobble in the tone on pressing a key which disappears in seconds. Then all is good.
This suggests to me that a component(s) is faulty and is “leaky” but starts to function correctly when it has warmed up. Any ideas?
One other thing I would like to know is whether how long the synth typically takes to initialise. I have noticed that when cold the buttons light for around 8-10 seconds before the synth initialises to preset A1, but when it is warm it initialises instantaneously.