Bias Preamp tubes?

[abecon5]

hey Guys, this may seem like a dumb question, but do you have to bias preamp tubes too, or just power tubes?
I am talking about non-mesa/non-fixed bias amps of course
thanks!

 

[edgarallanpoe]

Power amp only. No need to bias pre tubes.

 

[ytse_jam]

www.mesaboogie.com/US/Smith/ClassA-WebVersion.htm

interenting and educative reading!