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Thanks so much, i would never have thought about accessing the fan through the front panel. If it's not too much trouble I would really appreciate seeing the photos. Best, paaes335

I own a MKII simulclass head built in 83. It came with 4 6L6's and the early MarkIIB literature I have when the simulclass feature was introduced mentions nothing about using el34's in the outer sockets. All of the ad photos from early 80's showing simulclass switch on MKIIB's have 4 6L6's...

Looking for some guidance here. I need to replace the colling fan in my 83 MKIIB Simulclass head. I have a new fan ordered from Mesa. Is this something realtively simple to change out on my own or better left to a tech? I can't really see how the fan is attached since tubes, reverb pan etc are...

Thanks to everyone who chimed in. Just the mention of Birds of Fire still brings awe to me. I still have the original vinyl record from 72-73, after nearly 40 years this music sounds as much ahead of it's time now as it did back then! I think McLaughlin started using his Boogies on "Visions of...

Hi, Maybe most folks here have seen You Tube videos of John McLauhghlin from 1974 playing his Rex Bogue custom doubleneck 6/12 through MK I Boogies. If you ever want to hear first hand the tones from these amps this is a good place to look. Just search "Mahavishnu Orchestra 1974" on You Tube...

Many thanks for helping with my question. I also found a good article over the weekend on the Mark I design written by Dave Hunter in a Vintage Guitar mag from 2007. I'll scan it and post when I have a chance. Sad part is, the issue has a cover story on Gary Moore, strange timing.

Hi, I'm new to this board, this is such a great resource! Can somebody explain the 3 volume architecture of the Mark I Boogies? I've owned a 77 112 combo and reissue, they were both great amps but definitely had some differences. Seems I could get more gain from the 77 using input 1 than I was...