#1
are tube amps ready to play after buying them(new) or do i have to get it setup like biased or something???
#2
should be fine. biasing is for when you change tubes if it's not fixed bias.
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#4
2nd all of the above. Depending on the amp, you might want to check around to see if the factory bias is cold or hot and maybe see if you can find some opinions on what a good bias is.
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