1985 MkIII Black Dot Simul-Class or 60/100 question

[Ed Mullins]

My MkIII does not have a simul-class sticker or any other identification that it's a simul-class amp other than the EL-34s in the outer tube sockets. I've scanned this forum for similar questions and noticed an older amp with the letters 'sc' on the back of the chassis. Mine doesn't even have that identifier but still has EL-34s in the outer tube pair. Is there a way to identify a simul-class amp without removing the chassis to inspect the output transformer or power tube wiring?
My amp sounds great as is. What is the harm in running EL-34s in the outer pair and 6L6s in the inner pair if it's not a simul-class amp?
Thanks for the help. This forum is incredibly helpful. You guys know your stuff.
Thanks,
Ed

 

[Boogiebabies]

The OT # should be 562003 or a left over 152019B. It's stamped on the housing. Othere than that, you would have to look at the power tube socket wiring.

 

[Ed Mullins]

Thanks a million. I had to remove a power tube along with using a mirror and flash light to see the info but it was visible. Simul-Class is printed on the side of the 152019B OT. Thanks again.

 

[Boogiebabies]

Coolio.