Bias for Express 5:50 6l6's

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jamme61

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Do I have to have the bias adjusted? I have some NOS 6l6's that I like to run. Thanks for any help on this
 
I do not know how to do it but the tech I take my amps too said its an easy mod. Just change out a couple resistors and add a pot, under a hundred bucks he said. 10 bucks for parts and an hour labour
 
Thanks I guess it's on its way to the tech don't want to screw it up.
 

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