Can I use E34Ls or 7581A tubes in my Mesa Mark III?

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I had a simul-class Mark3, and 15 watts on 2xEL34 was louder than a 100 watt Infinity stereo. :lol: Now I have a mark I re-issue, it takes 4xEl34s, 4x6L6s, or 4x6V6s. I want to try the 6v6s when I get the moola!
 
Yes it is simul-class Markedman. I run EL34s currently but I was tempted to try E34Ls for more power but I've heard other amps having problems with them and didn't want to take the chance.
 

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