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I bought the amp in the pics. It turns out it's a '73. Fender transformers. Presence knob on the back. Super gainy. Very loud. I thought it was an exaggeration when the old Mesa literature said these 1x12s could keep up with 4x12s, but now I'm a believer. The Altec 417-8H has very pronounced...

I thought Altec's were options throughout the 70s. This is an information letter from 1976 (apparently). It mentions Altec as an upgrade option. http://homepage.mac.com/mesaboogie/MarkIguide.html

Looks like all the caps, including signal and electrolytic caps, were replaced on this?

Rear shot: It's got a Prune Music sticker (the place where it all began, though the sticker is after Prune moved).

I agree with this 100%. I've always thought of them as 6L6GCs since they have the same sound to me. If I want nice, full, airy cleans with EL34s, I use Sylvania/GE 6CA7s.

Great, thanks for all the info guys. I read that In the beginning a lot of the Mark I's were custom builds dependent on customer specs? As mentioned, the extra gain stage was introduced in '71 - so are there Mark I's w/o the extra gain stage? or are there only modded Princeton's before Mark I...

I've always been a fan of Santana's tone on Abraxas and have always been curious about early Mesa/Boogie's in general. I've owned a lot of amps, but never a Mesa/Boogie. I dug around the Boogie Board, but there seems to be little info on the Mark I. Any help would be appreciated - I was...