Just an update on this amp. It's been about 4 months running the JJ tubes I was told not to use. I play the amp for 4 hour performances and 3 hour practices twice a week. The amp has not had any type of issues. Having the fans vent the head unit keeps it cool to the touch and is most likely extending the life of the circuit boards and components. I am still very happy with the sound of the tubes on stage.
I already bought a duet Mesa/Boogie 12AX7 Preamp Tube and some Mesa/Boogie 6L6 STR 440 Power Tubes-Matched Duet for my SV MKII, 40. But I confess that I am afraid to make the change because I do not know if they are compatible. And I don't know how to do the Bias.
Spider Valve MKII 112 Bogner - Overheating
in Spider Valve
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I already bought a duet Mesa/Boogie 12AX7 Preamp Tube and some Mesa/Boogie 6L6 STR 440 Power Tubes-Matched Duet for my SV MKII, 40. But I confess that I am afraid to make the change because I do not know if they are compatible. And I don't know how to do the Bias.