New to tubes have questions


Hello All,
I am going to try a tube amp and I have a few questions I need help on. I have read the manual but I need to be clear
1) is it bad to play the amps without them warming up? will this hurt the amp?
2)does the amp have to be warmed up to check the bias?
3)what is the biggest don't with tube amps?
Please help me understand these questions
Thanks
harnellt
The biggest "don't" is never power on a tube amp unless it is connected to a speaker.
Gs5556 and Pawlowski6132 named probably the biggest don'ts.

If you get a tube amp that has a power on switch and a separate standby switch, be sure to follow the owner's manual and don't turn them on in the wrong order.
Thanks to all of you for your great advice. I do now feel better about what I need to do with my new amps. The manual is not as specific as you have all answered.
Thanks again