How to bias a tube amp with a Multimeter

@larryi yes, and the bias points are so close I can barely get the tips of the MM onto them! I don’t know what to make of the screws,

I tried searching for a manual for the amp with no success.

yes, speakers are connected, and the amp is fully operational. No there is no incremental mV adjustment on the MM

Is it possible the bias pots are adjusted so low there is no flow through them?Maybe try turning the pots up(make sure no signal to amp & volume control turned down) & check again...Other than that,my next move would be opening the amp up & checking the connections at the bias test terminals...

@freediver yes I’ve tried turning each pot, and still no reading on the MM. I’m afraid I have to take it to a technician, which means a 45 minute drive each way. Oh well!

On your multimeter, make sure the black lead is in the COM jack and the red one is in the proper jack for measuring voltage.  On some meters there are different jacks for the red to be inserted in depending on the function you select.  If your meter has only one input for the red probe, then that would not create problems.  If there are two input jacks for the red probe, be sure to select the correct one.

Yes, probes are properly connected. 
 

I was just quoted $130 to bias the amplifier. But I’d have to wait 4 weeks to have it done because of other jobs ahead of me! Argh.