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Simul-class is 75, for the 300 series it's 150. JJ's work best since that is what mesa ships in their amps.

I use two Mesa Triples for my 4-4×12's, might be the best way to use 2 amps, not sure there is another way, works great!

Glad to help anytime!! It's beautiful!!!!

I posted the picture. Yes, 250V fuse. The 3A fuse is there because someone put it there.

The older 2 channel triples take a 6.25 amp SB fuse, the newer rev g triples are 4 amp. I have 2 of the older rev f triples.

Same thing was wrong with my DC-5 head, I sent it to Mesa to get fixed and they sent it back to me, nothing was different, the popping noise was still there, Rich Duvall from Mesa told me it's just the way the circuit works, and it can't be fixed, so I sold it. Good luck

Chinese https://www.watfordvalves.com/product_detail.asp?id=1807

I measured 20 5/8" for the chassis, and 23 3/8" full width

Short head 18 3/4" Long head 23"

1. matched pairs in the correct bias range 2. my experience is that I didn't like it, maybe it was the Chinese tubes, I do like Tung Sol and JJ. I don't use any boost pedals or the effects loop (off), and I use the silicon rec because it tightens up my tone. I hope some new glass will make...

EL84/6BQ5 Russian 5881 STR 425 Russian 6V6 STR 417 Chinese Sovtek's are made in Russia, JJ's are made in The Czech Republic, which Mesa is currently using for their 12AX7A. Only other company in Russia making 6L6 is/was Svetlana.

I'm sure there is, you can search the interweb, I've never needed to switch anything that much on my Mark III Coli.

I was wondering if the single rec version one, was fixed bias like all the other Mesa amps from the factory or did it have a bias adjustment?

My guess is 1999

I figured all you 2C+ plus fanatics would lose your mind over this.

And there was only one revision change on the 2 channel Triple.

I have a '95 Dual chrome face #5674 with the F specs, but it's a G. Look on the motherboard underneath the big blue caps etched in gold. The date will be written in the corner. Never heard of the "X" in the serial.

Your Triple is most likely a 3 channel, they stopped making 2 channel amps in 2000 and started the 3 channel. Revisions were only made during the 2 channel era.

The switch in the left is for DC and Calibers and won't work with Mark III's. The switch on the right is correct.