Yamaha CS80

> keep the room warm and put a towel on top of 
> the boards to keep the heat there. Tuning goes quickly and efficient 
> that way

Another great idea!

>I noticed just one problem on one of my CS80 while tuning: I can't 
>get the reference voltage (adjusting vr3 BA-board) to 4,0 V. It's at 
>3,96V so it's out of spec. I need to turn the fine-tune-knob quit a 
>bit to achieve 4V so I didn't. 

Is your -15.0V supply correct? Asking because the 4V are derived from that.

JH.