Pitch problems on Etherwave Std

Got an Etherwave Std last month.
Over the last week, whenever I turned the PITCH knob, the whole theremin would go “unstable” in that the pitch would start to “flutter” all over and even while I hold a note, the pitch would zip here and there (and, NO, I wasn’t moving!)
I would then have to leave the Etherwave on for sometime, before the pitch would “calm down” again. When it “calms down”, the moment I turn the pitch knob, it would start this problem all over again!

What gives? Can someone please help?
Thank you!

QF

Have you Tried tuning your pitch circuit…

I found the instructions in the manual hard to under stand…

Tuning is explained, in an easier to understand way, here:

http://www.thereminworld.com/forum.asp?cmd=p&T=2063&F=1

Please Let Me know if this helps.

Sam