Mark IV(a)combo with all 4 El34

[strippymo]

Hi, is it possible to mod Mark IV inner tube sockets to run El34 like outer, with bias switch 6l6/El34?
So if i wanna go with all four El34 or go back with 6l6.
Thank you.

 

[tim6string]

I am not an amp mod expert, but I would have to say it must be possible. It would be a mod, most likely to the bias. I would make sure you really knew the tech doing the work. I just don't trust anyone with my Mesa. (although there is a place I will go to here in MN)