[sdiy] unstable Korg MS 50 vco

[ganesha]

Hi,

I recently bought a Korg MS 50 but I noticed that the VCO is very unstable for the first 10 minutes after I turn it on. It's not just detuning but it really jumps from high to low notes and vice versa.

This is the case with both the HZ/V and OCT/V inputs. After 10 minutes, there is no problem anymore.

I've checked the schematics. Could it be the 2SC1583 that is causing this?


http://www.korganalogue.net/korgms/service/ms50/ms50schemos.pdf

Thanks.