How to bias a tube amp with a Multimeter

@larryi @freediver thanks for your suggestions. I will try adjusting the MM, and the screws on the amplifier tomorrow to see if I can get a reading. Thanks for your assistance!

Here ya go!

https://www.galvinpower.org/bias-tube-amp-with-multimeter/

Measure the resistance at test points + and - with the amplifier powered off. If you cannot get any resistance readings, you cannot bias the output tubes.

If this is the case, the problem may be a bad meter probe or the amplifier test point is not connected to the cathode resistor.

It is easy to check the meter probe--just touch the two together when testing conductivity or resistance.  Probes are often pretty cheaply built and the wires, because they are constantly being moved and stretched, often do break.  That is a good observation of possible unexpected problems.

Any luck?