#2
its basically setting the working point for your tubes

if your bias is too high, it'll shorten tube life or blow them directly, if its too low the amp will sound lifeless

i could explain this more if you'd only speak german

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#4
Quote by life_777
still don't understand.

You need to do it whenever you get a tube change, I think (I wouldn't know, my amp's fixed bias ). It's not rocket science, but it's a good idea to get someone to show you how to do it first.
#5
Quote by life_777
still don't understand.

its controlling the working point of your tubes - the (negative) voltage that runs through the grid of a triode (or pentode) tube

have it done by a pro - no questions need to be asked

http://en.wikipedia.org/wiki/Grid_bias

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Quote by stevo_epi_SG_wo
france is laaaaame


Recognized by the Official EG/GG&A Who To Listen To List 2009