bias question

any help appreciated; I have a cat jl1 and when I hook up my meter to the biasing terminal im not getting readings, the tubes light up and the meter works on the other amp.If one of the driver tubes is bad will that make it so it wont bias, thanks
Does the amp work- play music?

If not, most likely a tube shorted and took out a big resistor pack located under the amp across the big power caps. It is two large ceramic resistors glued together. They work like a fuse when a tube grid shorts. If the amp is playing music, I have not a clue.