Does anybody know, if zero-point position of AC, positive full-wave and negative full-wave collector supply modes can be adjusted individually?
My problem is:
If I adjust zero-point position using the front panel position trimmers let's say for AC, I have to correct position for positive or negative full-wave for a few millimeters to fit the graticule.


I could imagine there maybe internal calibration to fix that problem.
Can anybody help?
Is there a service manual for 370 (not 370A or 370B)?