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Nice work. I am pretty sure there is a schematic on this forum somewhere for grabbing the extra voltage.

I am pretty sure it can't be done without swapping out the transformer. While I was researching changing my 20/20 I remember reading that the 20/20 is one of the few Mesa Boogie products with a multi-tap transformer. Not 100% sure, but 99%. Check with a tech. www.tubeampdoctor.com will probably...

Heu Joe, good stuff in this thread... http://forum.grailtone.com/viewtopic.php?f=13&t=37721&start=15

Yes I AM happy!!! I'm not very familiar with the MkV, but I have no doubt the Axe would work very well with it. I think and important thing with effects placement is having them at the right point in the signal chain, before or after the pre-amp. I had originally tried the 4 cable method with...

I've bought an AxeFX, mentioned it in this post viewtopic.php?f=5&t=39778 and have been asked the following: "Would you mind starting a string under effects on your FX unit honeymoon progress or send me an email? I just got a MKV and love the preamp it has but want great effects, comp, chorus...

Yep, still need a power amp. Or a full range flat response speaker (FRFR), like a PA speaker. I am using a powered one, so my rig is now simply guitar>AxeFx>PA speaker. So light and easy and stress-free! The AxeFx produces a whole signal chain all the way through to sims of cabs. I initially...

OK I swapped the fan out and also tried a lower air flow fan. Turns out the original is the best. But now I've bought an AxeFX anyway. (Fantastic BTW). It too has a fan....

Hmmm. I see why - you switch capacitance to infinite. My mod switches it to zero. It still sounds better but I should have looked at the circuit diagram more closely. I see it is the 1uF cap and bridging this also shorts the tube to ground. I feel a bit stupid. Fortunately I have mostly left the...

Hi Steph, The picture links are not working.

Hey, I think I'll try that. I guess you have installed a relay circuit and hooked up to a footswitch? I've gone really simple and just put a switch in parallel with each of the caps, and mounted them in a little plastic box on top of the amp. My pre-amp is shallow, so I have the room to do that...

Thanks Snoopy. Turns out the conversion is fine. I might have a power tube on the way out, but hammered it for hours on Friday with no issues. Getting new tube set just in case. BTW I did the deep mode and made it switchable. Not sure whether I like it better with/without, but I can switch one...

I was using a "slo-blo" fuse initially when it first blew, and for the next time I didn't have one handy so used a regular 1A fuse. I have some more slow blow fuses now, so planning to change it back. I don't have an ammeter to put in line, but do have an AC current clamp. I think I can borrow...

No problem at volume on other channel. Assume therefore not on the power supply side.

OK, so if I understand right - same fuse type and just play with the volume at a low level. I'll do that tomorrow and report back. Thanks

I've bought a used 20/20 and the I also find the fan pretty noisy Part of it is mechanical noise form an old fan but a lot of it is the airflow itself. So I've ordered a replacement Sunon fan of the same rpm and airflow and another which is about 2dB noisier from the fan itself, but about 20%...

The other things I was told to to do were: 1. Change the 2A fuse to a 250V 1a fuse (twice the voltage, half the amps - makes sense) - but if anyone has an "original" 240V model, I'd be interested to know if it is actually this rating 2. Change the metal oxide varistor (MOV). Mesa wanted to...

Schematic shortly. Downloaded from here... http://www.bnv-gz.de/~ooehmann/schematics/mb/20_20.zip

Can't find the link again but here are the photos:

Well I bought a 20/20, tested it first using an isolating tansformer, then did the conversion. I got the details from the jemsite forum. BUT - it worked OK for a while, jus few minutes use at low volume, and tonight I had the chance to crank it and it blew a fuse. Now the jemsite instructions...