Soundlab Plus produces different tone every time it turns on

[OW]

Hey,

So, I have recently noticed that every time I power my Soundlab Plus up, without adjusting any pots, it seems to produce a different tone. Does anyone know why it is doing this?

And how I could fix this?

Any help would be greatly appreciated!

Thanks in advanced!

[adambee7]

Do you let it warm up.?

[OW]

Warm up? The sound is produced as soon as I flip the switch, so I'm not sure as to whether it needs to warm up?

[OW]

Could this possibly be fixed by using matched transistors and tempcos, thermally coupled on the 2 VCO's and silver mica caps on the integrating capacitors?

Thanks!

[adambee7]

Sometimes oscillators like to warm up for ten mins to become stable. Matched trannies are a must really for this aswell as tempcos. I did both my SLs with handmatched 2n3904s using ray wilsons schematic for tranny matchers.

[OW]

Turns out that this only happens when the 1V/Oct keyboard is connected. So it's not the soundlab.