#1
Hi guys, I just had a quick question about the current Mesa/Boogie Mark IVs... on the site, it says it's 85 watts, with something called "Simul-Class" power. Does this kinda mean... that it brings it down to a lower wattage? Or what...?

Also on the front it has a switch with two options "Full Power" and "Tweed Power". I have a feeling the two things I asked about are somehow connected.. but yeah, could someone explain what both of these mean?

Thanks in advance.
#2
Simul Class is in the power section...it allows you to either run all 6L6s, or a pair of 6L6 and a pair of EL-34s at the same time. All for your personal taste.

As for power-scaling, I believe the IV goes down to as low at 15 watts...using different combinations of full power, tweed power, Class AB, and Class A, you have quite a few different power configurations.
#3
Ah okay, so you kinda have the option between 6L6s and EL-34s? Cause it says it 4x6L6 on the site, but I remember hearing in an interview that Mark Morton had a 6L6/EL-34 "blend" in one of his Mark IVs.

And then yeah, whats up with the power switch? Cause on the front all I see is a Standby switch but I'm kinda used to having another switch right next to it. I have a feeling the explanation is something really obvious and I'm totally overlooking it but I'm just curious.
#4
like Eric said, there are several power settings. You can run 4x6L6, or 2x6L6 + 2xEL34. In simulclass, all 4 tubes are active, in Class A, only the outer tubes are active. When you run it in Class A with 2 x EL34, it will run the EL34 in Class A. The Simulclass/Class A, Pentode/Triode, and Tweed/Full give you different power options.

Simulclass and Pentode = 85W
Simulclass and Triode = 70W
Class A and Pentode = 50W
Class A and Triode = 30W

The Tweed/Full switch is supposed to act like an internal variac, lowering voltage across the internal circuit. It's main intention was to try and simulate the "brown sound".

EDIT: and there are 2 switches on the front, the power and the standby are right next to eachother.
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Last edited by Erock503 at Nov 15, 2007,