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...3 channel dual recto, maybe about a 2005 and in really good shape...I'd like to keep it that way. I just want to make sure I don't eff anything up in regards to the tube settings, bias and all that jazz. some quick pointers would really be appreciated eg. it looks like I'm all set up with...

for example, if I have the serial # will the last two numbers tell me? if not, is there any other easy way to tell? Thanks.