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Bassman 135 bias mod??

11/6/1999 7:38 PM
Bassman 135 bias mod??
Hi Ampagers!  
From what I've read so far the Bassman 135  
seems to have a different bias circuit  
being more a kind of "bias balance".  
I guess this works when you replace the power  
tubes with NOS Philips 6L6GC (original Fender  
I'm not sure if I can leave the original  
bias circuit when I replace the power tubes  
with a modern set of four matched 6L6GC.  
My question: do I have to change the  
bias circuit?  
If so, can somebody tell me how.