Which Mesa guitar amp has 12 power output tubes

Question

There is supposed to be one of the Mesa guitar amps that uses 12 power output tubes in some sort of push-pull parallel - parallel manner. I'd like to look at the schematic, just to see how it's wired. Most or all guitar amps have online schematics, but there are 50 or more models made by Mesa, so I dont know which model to look at.

Does anyone know which model this is?

I'd also be interested in URLs for any other amps that use more than 4 power tubes.... I did find a poorly made drawing of a Fender 400, which has 6 tubes. The schematic is hard to view though.

I've always wondered if there was any limit on the number of tubes that could be paralleled to gain huge power wattage outputs. (Of course I know the size, weight and cost of the output transformer sets limits).

Thanks

jrwalliker · Accepted Answer

I once saw the PA system for a sports stadium.  This had rows of 807s.  i don't remember how many, but there seemed to be a lot. John

Phil Allison · Answer

**The Bass 400 plus. ** Same other Boogie amps that use tubes in parallel push pull.  ** You always say that.    ....   Phil

tabbypurr · Answer

Why would output transformers limit it when you can series/parallel as many transformers as you want? NT

Tim Wescott · Answer

Because he's talking about the size, weight and cost thereof.  It doesn't  matter if it's one or many, the weight, cost, and volume per watt is  going to be roughly constant. --  Tim Wescott Control systems, embedded software and circuit design I'm looking for work!  See my website if you're interested

tabbypurr · Answer

If some of the valve gear I've moved was anything to go by, they didn't worry too much about size, weight & cost. NT

Jim Thompson · Answer

Tim Wescott · Answer

True, but if you're going to build something now you'll find that the  transformers are the most expensive parts. --  Tim Wescott Wescott Design Services  I'm looking for work -- see my website!

Which Mesa guitar amp has 12 power output tubes

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