Vintage Synth Repair

Update.... 

I checked the Pot, it is a linera one, because the Russians used to 
have only this type. 
It has to be a Reverse logarithmic one with 50kOhms, like in the 
Minimoog.

6,3mm plugs are Ok, only a little bit hard to insert them... 

The Keyboard modulation via the dedicated Keyboard LFO is now working, 
there where some problems with a foam rubber under the keyboard...  I 
had to replace this. 

So, the unit is great.... ;-)