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MK4 troubles...

6/30/2004 12:16 AM
MK4 troubles...
Hi, I have to repair a Mesa MK4..  
This one have too much crunch on the clean channel and I don't know why !!!  
On my scope I see an ugly signal, look like stair ont the sinusoide.  
Any idea ?  
( tubes are all news )  
Other little question, how to bias correctly this fu### amp ??? I place a trim-pot in place of the ground resistor but I don't realy know about simul-class... strange...
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