@zenith5106 Thanks a lot!
Unfortunately, I do not see the information on how to calibrate R12 :-(
It looks like every manual promises the information will be in another manual. It is highly frustrating.
The P6042 service manual says "...adjustment procedure for R12 supplied with T1. Order Tektronix Part No. 050-0439-00"
The 050-0439-01 instructions you so kindly provided say: "If R11 was installed...adjust R12... to the CLOCKWISE extreme" and "If R13 was installed...adjust R12... to the COUNTERCLOCKWISE extreme", followed by "Refer to Manual Insert for recalibration"
And the manual insert (that you also kindly provided) totally ignores the issue :-( :-(
I can hardly believe that fully clockwise or fully counterclockwise is the final position of the adjustment. If that was the case why use a variable resistor?
