[sdiy] Solina String Ensemble calibration question

[Roman Sowa]

It adjusts -15V rail voltage needed for keying.
Set it to see -15V at the emiter of TR2 with no key pressed.

Roman

W dniu 2022-05-30 o 19:11, Rutger Vlek via Synth-diy pisze:
> Dear list,
> 
> As you may have inferred from my previous post a couple of months ago, 
> I'm restoring an old Eko Stradivarius. I have the schematic for it, but 
> no service manual with calibration instructions. From the schematic, I 
> could establish that the Eko is nearly identical to early Solina String 
> Ensembles and was hoping to find someone here experienced in calibrating 
> them.
> 
> My specific question is about the 2K2 trimmer labeled 422 (part of the 
> "rail voltage and crescendo circuit") in this schematic of the solina: 
> https://manuals.fdiskc.com/flat/ARP%20Solina%20Schematics.pdf 
> <https://manuals.fdiskc.com/flat/ARP%20Solina%20Schematics.pdf>
> 
> What does it do and how should it be calibrated?
> 
> Rutger
> 
> ps. Besides the absence of the trigger input/output, the most 
> interesting difference between the Eko and the Solina is the ability to 
> continuously adjust the level of each voicing on the Eko (versus on/off 
> switches on the Solina). Depending on levels, interesting phase effects 
> happen between the string and brass registers (and also with 
> crescendo's), that originate from the phase response of the formant 
> filters in the brass section (I think).
> 
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