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The pin thing could be confusing me, no question about that. What looks to me like it should be "pin 3" has no connection in the circuit, so if you are correct, Eet, it is possible that it is actually "pin 6." But the pins on either side of the guide slot are tied together. I did talk to Mesa...

Finally got around to opening up the amp, and the outside sockets' pins 4 and 8 are tied together, separated by a resistor. Socket 4 on the inside sockets is tied to socket 4 on the outside sockets, but not to its own socket 8. Both the inside and outside sockets' pins 1 and 8 are tied together.

Interesting. I will check it out. Thanks.

As far as installing tall tubes, removing the cover (in a rack setup) would definitely work. On the other hand, no one else has mentioned anything about modifying the sockets to accept the EL34 tubes. There has been some confusion about which sockets were correct, but I believe that to be a...

A fixed bias means the tubes have to be within a tighter spec. Mesa's theory is to use select tubes and eliminate tech quirks that not only cost you time and money, but can screw up the amp's engineering. If I was set up to bias my own amps, I would be more inclined to consider fudging Mesa's...

Got through to another MESA tech today. He confirmed the Class A sockets can accept EL34 tubes, but that they won't be putting out their maximum due to the way the amp is wired and biased. However, the problem is most of the EL34 tubes are too tall to fit inside the amp cage! That's good to...

Thanks for the socket layout. However, it does show the opposite of your previous post. That is, the Class A sockets are at the outside (left and right), as opposed to in the middle or across the rear. And I am still not convinced that the EL34 can be just popped in (at least to good effect). I...

I have a Mesa Simul Stereo 395 Switch Track amp (from about 1990). It currently has eight 6L6GC tubes (four per side) and can run in Class A, or Class AB and A combined. Four of the tubes (two per side) can be exchanged for EL34 tubes to get more dirt in the Class A setting. The manual is...