Originally posted by MitchSchaft
Abso-freakin'-lutely. That's one of the cool things about this amp. I've got EL-34's in mine and will throw 6L6's back in 'em today.
Here are the bias readings from the manual
6L6/5881: 28mV to 35mV
El34/6CA7: 30mV to 38mV
E34Ls: 35mV to 45mV
6550: 35mV to 45mV
Ooh sweet.......time to order some JJ EL-34L's!