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Does your combo not have a fan built in? Mine has a hardwired one by the speaker, pointing right at the power tubes.

You have to be more careful with bass rigs, because at low frequencies you can blow speakers without even exceeding their power handling. When I put a 5 string bass through my D-180 into two EVM-15Ls, I could hear them starting to fart out on low notes even though they were nominally 400 watts'...

Haha, I'm sorry! I meant to say "I doubt a single EVM-15L will last if you're playing bass through it, unless you're consistently keeping it below medium-loud volumes." The couple times I used just a single 15 at shows (with a comparable Mesa head), I felt like I was pretty close to the edge.

I doubt it, even if it's the higher-wattage version. I had a D-180 (also 180 watts with 6x 6L6 power tubes) and when I ran that through a 1x15 I could see the speaker working pretty hard even before I got it super loud. This was with an EVM-15L, and then later an Eminence Kappalite 3015 in the...

Only half on-topic, but I use a Studio Preamp in a bass rack rig. Driving a 2:90 simulclass power amp, so I guess adding up to something like a supercharged Coliseum?

Followup: Mesa tech support says you can do it safely but they don't think it'll sound particularly good because the amp will be running the EL34s colder than they like. Anyone actually try this, or mod a 2:90 so you can tweak the bias to be more EL34-friendly?

Has anyone tried running EL34s in the class A sockets of a 2:90 power amp? I was reading that you can supposedly do that, and I can imagine it sounding cool...but I don't have any EL34s on hand and thought I'd ask around before ordering a quad of them.

I think the Mark 2/Mark 3 family (including the Studio pre) are much better "rock" amps than the rectifiers are. They sound great all over the gain range, from totally clean to overdriven to all-out distortion. Rectos are a high-gain one trick pony by comparison.

Played my first show with this (using a pair of 1x15s, because I didn't want to drag a vintage 8x10 to this one). Sounded pretty good, tons of low end for a guitar preamp. At this point I have the outputs on 5, power amp volumes halfway, presences zeroed, and just use the master to set my...

Power amp arrived last night, sounded good at home testing volumes. I still need to make a couple of shorting plugs and bring the whole thing down to the practice space though. And, of course, re-wire my 8x10 in stereo so I can use both power sections. It never ends.

No kidding?! I was thinking there must be some obvious solution I was missing since it seemed like Mesa had thought of every other possible option for that power amp. Definitely going to need all 180 watts for a bass rig, I guess I'll build a splitter cable if I need to use the effects send...

I also just realized that on a SP or Mark 3 the lead "channel" (i.e. boost and master) comes before the rhythm volume, not after as the tube and knob layout had led me to believe.

I've seen a lot of people say that. How do you connect a 2:90 so that it runs both sides off the same mono signal? This seems like a super obvious thing but there's nothing in the manual and I can't see a switch or easy way to jumper the input jacks.

This was my instinct. What do you do with the SP's "output level" knobs? Glancing at the tube chart it looks like they're V4, so I guess an actual gain stage and not just another passive master volume...

Awesome, thanks! I played with it more seriously today in the practice space. The volume/gain thing is so weird compared to the Mark 3s! It kind of seems like: With a Mark 3 if you set the rhythm channel to overdrive, you can hear it start to make the lead channel a bit fuzzy, loose, eventually...

I've been using Mark 3 heads and combos for awhile now and am taking the plunge into a Studio Pre and 2:90 rack rig for the first time. So far I've got a bunch of questions, and I'd love any feedback (har) from anyone who knows their way around these things! Once I've got everything connected...

Just realized there was a whole sub-forum for rack gear that this obviously should've been posted to. That's what I get for having Vintage Amps (Before 1991) tunnel visions. Not sure how to delete a thread, but anyone who can should feel free to do so!

Whoa, that sounds...odd? I mean, I can definitely see the compensated outputs being weird-sounding but would have figured the regular ones would be fine. That rig looks awesome! Which control(s) do you use to turn your volume up and down? My instinct from running rack PA systems would be to set...

Great high and high-ish gain amps. I've used my green stripe combo (+ TL806 extension cab) for metal practices and shows, and I've also bypassed the combo and run it into 4x12s in the studio. Use less gain than you think you need, because when you crank them these amps have a weird way of...

I'm going to be taking the plunge from heads and combos to a rack setup. I know this is a really rudimentary question, but I don't want to get tripped up with all these new knobs... How should I be setting my master volume, output volume, and power amp volumes? Which one(s) should I be using to...