SkyhighRocks
New member
How do I get to the bias pins on this amp? What do I need to take apart? I have 2 gigs this weekend and I want to check the settings asap.
kannibul":eca57 said:
SkyhighRocks":8e887 said:
SkyhighRocks":75718 said:I got the chasis out but how the hell can I bias it if I need it upside down AND plugged into a cab and powered on???
Marshall Freak":8a006 said::|::QBB:
Just turn it upside down. The transformers are usually taller than the tubes, set it on it's tranny's, then plug it in and bias it.
kannibul":c844d said::|::QBB:
Nope!
Set it in the headshell, so that the tubes are "pointing" at the front panel.
Basically lay the headshell with the Marshall Logo facing down, then set the chassis in the headshell with the tubes facing downwards/guts up.
Plug in, turn on, etc..
SkyhighRocks":219cc said:I'll have to try that next time. I basically had it upside down on my table with 2 books under the shorter transformer. It was biased a little low...like 57 on each side. I put them both to 70.
Marshall Freak":84ad7 said::|::QBB:
I wasn't sure if the back of the headshell was still like the old ones so I didn't know if that was possible with the JVM.
I've got to get one, driving me crazy.
SgtThump":d8914 said:I just lean the chassis up against my speaker cab with the transformer part touching the cab. Works like a chart when accessing the inside to set the bias.
I already forgot what I set my bias to. Was id 70 or 75? I can't even remember now. May have even been higher.