How do you bias the Colby Mod Machine?

lgehrig4

Gold Supporting Member
Messages
6,244
Specifically, where do you take the measurement from? My trusty bias probe doesn't work on this amp so it must be wired differently than your typical Marshall, or amp for that matter because I can use this probe on any amp.

I know I could contact Mitch but I have done tubes that I wanted to try tonight.

Any thoughts?
 

Blue Strat

Member
Messages
30,723
Have you rechecked your probe on another amp? I know nothing of this particular amp, but if it's Marshall based and uses EL34s the bias probe SHOULD work.
 

lgehrig4

Gold Supporting Member
Messages
6,244
Good advice because it was the probe tip that goes to the meter. Must have come loose so I just tightened the set screw and it's fine. Should have checked before jumping the gun.

So for the record, the Amp Head bias probes work with Colby Mod Machines ;)
 




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