ARC VT60SE Bias help

[SeanS]

All,

My ARC suddenly became scratchy in one channel, at louder volumes (maybe noticeable there), so am checking bias, as per pics doc.

They do not mention the polarity of the multimeter vs. resistor. If I bias with the neg towards the trimpot I get the the 65mvDC, when I reverse the multimeter I get approx 30mvDC.
(I have biased with neg towards trimpot)
Any advice / pointers welcome

https://www.arcdb.ws/Database/VT60/ARC_VT60_bias_adjustment.pdf

 

[SeanS]

 

[SeanS]