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Vintage Synth Repair

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Estradin Altair 231 Russian Synth

2007-06-12 by ambrosia800

Hi, there! 

Has anybody out there any experience with an Estradin Altair 231?
I just got one, and there are a few strange things:
- filter resonance is sounding strange. There is almost no change when 
you turn the Pot until 3/4, but then only 1 mm more, the Filter is 
going into self oscillation quite loud! 
- The inputs should have 1/4" jacks, but if you insert a standard 1/4" 
jack, you have problems getting it out again... could it be that you 
have to use jacks less than 1/4" (6,3 mm)?? 
- the Keyboard modulation via the LFO (Oscillator 3?) is not working?

Any experience with this unit somebody?

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