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Biasing a Marshall DSL50 amp

5/9/2004 2:07 AM
muletone
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Biasing a Marshall DSL50 amp
Hello,  
 
I've got a JCM2000 DSL50 head that I need to re-bias. I own a Alessandro bias meter that has two sockets that plug into the amps power sockets and then the tubes on top of those.  
 
However, the DSL amp has a 3 prong deal with two little plastic screws to adjust the bias. Do I need a special guage or something? With the Alessandro in the sockets, I can't get the bias any higher than about 23ma on each side. That's max. It's doesn't seem right and it sounds terrible.  
 
Has anybody biased one of these amps?  
 
Thanks

 
Replies:
PAULH The center pin is ground and the ou... -- 5/10/2004 4:19 PM
Enzo SOmething else is going on in there... -- 5/10/2004 10:48 PM
muletone I think I'll drop some new tubes in... -- 5/11/2004 5:13 AM