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Complete VCF Alignment

 

Did someone achieve a complete VCF alignment?
I'm asking this because while following the steps on page 11 of the CS80's adjustment procedure manual, I came across voltages that are different from those on my unit, and even unreachable with the variable resistors.
Using VR7 and VR9 to shift the cutoff frequencies of both filters to get the maximum amplitude is OK. The problem occurs while trying to use VR8 and VR10 to set the resonance. The amplitude I can get is 2.8Vp-p, but certainly not 4.3Vp-p with HPF and 1Vp-p instead of 2.2Vp-p with LPF. Did someone notice analogous variations?
 

Hello,
I recently decided to calibrate the filters of the master boards.
Since the values on page 11 of the service manual are wrong, I made a few trials and finally chose the settings visible .?
What values are you using when you do a complete VCF alignment?
Perhaps one of you owns a copy of the service manual where the right values were added by a technician in the past?
Thanks for your answers and merry Christmas to all!
 

I wonder about this too. I have been in touch with JM while calibrating my CS-80 and after a few days of experimentation and discussion we have different findings.?

I had trouble on two voice boards to go up to 8.4Vpp for HPF resonance, so I decided to take the value from the CS-60 manual and go for the 7.6Vpp as instructed there. Not sure what the right value for a CS-80 is or where it starts to sound wrong.

Also instruction for the 2.2Vpp for LPF cutoff does not seem right. If I want to go for 2.2Vpp I have to dial the trimpot almost full to the end. The original value gave me a reading of 1.4-1.6Vpp, so I did the same as JM and used 1.6Vpp.

I wonder about the other guys who work on CS-80s how you handle this part or what your findings are?

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