Using a Digital Multimeter for the first time

Herman> your advise was absolutely correct.I may have done something inadvertently that would cause the problem.
I still dont understand why the instruction manual would read that the amp should be off when attaching the leads of the Digital Meter.Wouldn't this defeat the purpose of biasing an already heated tube.

Tube plate current

Rodman>The amp has jacks that accept the leads of the meter.
Correct me if i'm wrong.Your suggestion is to insert the leads of the volt meter into the jacks of the amp.Then turn the amp on and wait at least 30 minutes before taking a reading.
If this is correct can I play music while the meter is attached to the amp?
In the past,using an analog meter I inserted the leads while the amp was on to get the reading.Do digital meters operate different then analog meters?
Thank you for your help

Jea48> Thank you for your advise.
Herman> This morning I warmed my amp for 30 minutes and with the amp on I inserted the leads from my voltmeter.I turned the meter on and the amp started to smoke.I shut everything off, removed the leads and let everything cool down.
I powered the amps back up and everything was fine.
I then followed the instructions of inserting the leads turning the meter on and then powering up the amps and left it that way for 30 minutes and then took the reading.This worked perfectly.
I agree with your method and have always biased that way.I have know idea why my new Radio Shack voltmeter operates differently.

W.>I was measuring bias using a DC VOLTS scale.
The resister is still reading the same as is noted in the owners manual.I thank you for this information.