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I can't believe a mesa tech told you that. there's no reason you can't run all the controls on 10, other than perhaps the police and perhaps a surgeon general's warning about sounds over 105db causing deafness. Have you used the FX loop master trick? Plug a blank (non connected) guitar plug...

Long story, but in summary I purchased an F100 head and swapped my heartbreaker into the head cabinet, and put the F100 in my 212 combo cabinet. I actually am enjoying the F100 - but it's loud enough to peel paint off the house next door. I'd like to get it under control. 1. Is there any way...

I am thinking of swapping one of the speakers with a Jensen Blackbird, for a bit more vintage alnico type sound - I think it would mix well with the celestion vintage series speaker and get some more authentic blackface vibe. Has anybody tried this with their 2x12 amp?

Hi Scott! Like you I don't understand why these amps are available for sale, especially for so cheap. Probably the best deal in any amp out there. I played with the 5881 tubes for a bit, but really wanted to try the cooler EL34 option. Talking to Eurotubes, I expressed some of my concerns to...

Amp is back together (minus the back panel on the combo) and man it sounds freaking sublime. I am so totally stoked!

Digging around in one of my bins, I had a NOS 5881 Sylvania quad (I have no idea how or why!), and they were bundled together with "matched" marked to them from Antique Electronics. Putting them in the amp, in tweed variac mode with the 5AR4 tube rectifier selected, at 369V plates, with bias...

On my heartbreaker, the presence pot was bad. It was a mini body with a 3/8" standard sized bushing and D shaft. I ended up just shoving a non d-shaft plain old alpha pot in there, as the knobs were not cut for D shaft anyway. I'd look at the knob and see if you actually need a d-shaft pot.

I'd guess it's option two: "... a way to simply cram it all in". He's a snake-oil salesman. A fixed bias power amp merely means there's a bias voltage applied. As opposed to a self-biased amp, which means there is no bias voltage applied. What he's done is set two bias points, neither of which...

I found the schematics, and metered it out. The switch is in right, at least it matches the schematic, and the voltages from the bias circuit are as they note... all of which seems to indicate that boogie biases the amp way too cool in 6L6 mode, and just barely in usable range in EL34 with EL34...

I hooked up an SRS tube bias shunt and the 6L6GC are reading 22.5ma at 450V and 16.5ma at 384V. WTH? There's no way Mesa would bias this amp that cold is there? That's crazy. EDIT: So in the tweed variac mode, I get 384V plate voltage, and flipping to the EL34 bias position (versus the 6l6GC...

Any heartbreaker fans here? I am looking for tube choices for this amp. I am having a hard time decoding what it is mesa is selling in their tube sets (like what the tube manufacturer and series actually is). I've heard that the EL34 winged C is a great match for this amp, but which mesa tube...

Hi all, new member here. I used a Mesa Mk II back in the early 80s, it was a handwired unit (known because I peered in the chassis more than once). It was a real workhorse, and I used it all the way to a studio robbery in 1985. I've been mostly a marshall and fender blackface guy since then...