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Mesa Boogie 20/20 poweramp schematic?

Posted: 10 Jan 2008, 14:01
by Mayniac
Anyone ever came across a schematic for this poweramp?
I'd like to take a look at it...

Posted: 17 Jan 2008, 09:16
by Mayniac
bump

Posted: 22 Feb 2008, 14:53
by Mayniac
bump

Posted: 22 Feb 2008, 16:32
by analogguru
That´s the best Mesa schematic collection I know:

http://www.tubefreak.com/mesa.htm

analogguru

Mesa Boogie 20/20 power amp

Posted: 24 Feb 2008, 16:31
by eddieod
Hi Mayniac,

If you like to have the schematic, send me an email and I'll send you a pdf-file of it. Nothing special going on in there by the way. I've had one for repair over here for some months ago.

Ed's Custom Shop
Edwin Thoen
Maarssen
The Netherlands

http://www.edscustomshop.com

Re: Mesa Boogie 20/20 poweramp schematic?

Posted: 05 Mar 2008, 11:15
by eddieod
Uploading schematics has really become more simple now...

Have fun!

Edwin

Re: Mesa Boogie 20/20 poweramp schematic?

Posted: 10 Apr 2008, 06:20
by Nikifena
Thanks for the schematics.

I like to see what's inside the 20/20
Any pictures ?


Thanks

Re: Mesa Boogie 20/20 poweramp schematic?

Posted: 17 Apr 2008, 13:02
by eddieod
Sorry, no pictures available from me at least...

Edwin

Re: Mesa Boogie 20/20 poweramp schematic?

Posted: 24 Oct 2008, 13:01
by KataTS
Thanks for the schematics.
:wink:
Antonello

Re: Mesa Boogie 20/20 poweramp schematic?

Posted: 30 Oct 2008, 23:15
by Orkspalter
Heres a look inside

Re: Mesa Boogie 20/20 poweramp schematic?

Posted: 31 Oct 2008, 07:17
by Nikifena
THANKS!!!
great pics.

The output transformers look too small!
I'm 100% sure, that this transformer can't get clean sound

Re: Mesa Boogie 20/20 poweramp schematic?

Posted: 31 Oct 2008, 20:11
by boyfrenzy
Nikifena wrote:THANKS!!!
great pics.

The output transformers look too small!
I'm 100% sure, that this transformer can't get clean sound

Yes but the OT must be less than 4.4cm for a rack 1U!

Maybe there is the same transformers in the marshall 2020

Re: Mesa Boogie 20/20 poweramp schematic?

Posted: 25 Dec 2008, 00:17
by lucafusion.
Hi Guys. I have a question for you. Do you have some data sheet about the transformers? Thanks A Lot.

Re: Mesa Boogie 20/20 poweramp schematic?

Posted: 28 Mar 2011, 10:50
by p-evil
I have some questions too regarding this power amp.

1) Looking the schematic I only see two EL84 power tubes as the amp has four of them..right? So are the other two
connected same way as the two in the schematic?

2) If thinking of building similar power amp and leaving out the second channel, are the phase inverters needed anymore?
And which other components are not needed anymore?

3) What is the secondary voltage of output transformer XFMR #562020?

Re: Mesa Boogie 20/20 poweramp schematic?

Posted: 28 Mar 2011, 11:42
by Hides-His-Eyes
Just build it twice