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PostPosted: Sat Aug 11, 2012 2:48 am 
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Mark III
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Location: Germany
Just did a cap job on my 2:90 replacing all electrolytic power caps with new ones (the sig on the board says 9-1-92, so the parts were almost 20years old....about time for some maintenance).
While I was "in there" I also replaced all tube sockets with higher quality Belton Micalex ones.....
Here´s some gut shots:
Image
Image
Image
Image

Next up (and already on the way) is a matched integrated set of TungSol 6L6GC-STR and TungSol EL34B power tubes as well as 3 TubeTown E83CC bottles for the driver and PI slots. Thanks Dirk Munzinger of Tube-Town for matching iaw Mesa specs.

*Edit*: Just got this awesome collection of glassware in the mail today:
Image


Last edited by Triaxstasy on Mon Aug 13, 2012 9:54 am, edited 1 time in total.

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PostPosted: Sat Aug 11, 2012 3:13 am 
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Mark III

Joined: Sun Aug 16, 2009 9:44 am
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Location: Melbourne, Australia.
Sweet, you're ready for the next 20 years now!

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PostPosted: Wed Mar 26, 2014 9:13 am 
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Bottle Rocket

Joined: Wed Mar 26, 2014 9:11 am
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Does the board move?
I'm having trouble fixing my Pilot Light and Fan as I might have to unsolder a load of wires just to raise the board so that I can get to the Pilot Light and Fan cables.
Any help?


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PostPosted: Tue Apr 01, 2014 5:01 am 
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Mark I
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Joined: Wed Dec 26, 2012 3:05 pm
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Location: Norway
I realize that it's and old thread but...

The second last picture, why didnt you change the two upright electrolytic caps?
I thought that these also have to be changed...


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PostPosted: Tue May 27, 2014 1:54 am 
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Mark III
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Location: Germany
Sorry for the late reply....been away for some time...

...you mean C41 and C42 in the mode switching circuitry (lower left in this schematic)?!?
I changed them as well ;-)


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PostPosted: Sat Dec 27, 2014 12:52 pm 
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Bottle Rocket

Joined: Mon Dec 27, 2010 7:36 am
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I have a 2:90 as well and it has the same tube layout sticker in the back, 4x 6L6 for A and 4x 6L6 for B.

How/what do you have to do to use EL34s?


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PostPosted: Sun Dec 28, 2014 10:04 am 
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Mark III
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Location: Germany
Hi BlackBart,

There's no modification necessary....
Just get a matched quad 6L6 and a matched quad EL34.... And tell the vendor/shop that you need the tubes to be within Mesa specs.
I got mine (TungSol 6L6GC-STR and TungSol EL34B) from Tube-Town in Germany...awesome customer service


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PostPosted: Sun Dec 28, 2014 12:38 pm 
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Bottle Rocket

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Thanks Triaxstasy,

Which tube sockets do the EL34s go in?


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PostPosted: Sun Dec 28, 2014 2:09 pm 
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Mark III
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The EL34s go in the outer pair of sockets on the left and right, 6L6 in the inner quad.


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PostPosted: Sun Dec 28, 2014 3:28 pm 
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Bottle Rocket

Joined: Mon Dec 27, 2010 7:36 am
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Triaxstasy wrote:
The EL34s go in the outer pair of sockets on the left and right, 6L6 in the inner quad.


Thanks for the info! I'll have to try the 6L6/EL34 mix sometime.


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PostPosted: Sun Dec 28, 2014 9:08 pm 
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Joined: Wed Dec 22, 2010 2:57 pm
Posts: 289
Just for clarification, Triaxtasy is correct for the blue light 2:90s. The layout for red light 2:90s is different and given below (as well as a pictorial version of Triaxstasy's statement) :

http://s992.photobucket.com/user/Magnus ... d.png.html

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PostPosted: Mon Dec 29, 2014 7:40 am 
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Bottle Rocket

Joined: Mon Dec 27, 2010 7:36 am
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I must have an older 2:90.

The layout for speaker/input/mode-switching jacks do not match the illustrations and the power cord is hardwired.

Are there any EL34 options for older 2:90s?

Thanks!


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PostPosted: Mon Dec 29, 2014 7:52 am 
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Joined: Wed Dec 22, 2010 2:57 pm
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The older 290 is the blue light model. The newer model has a detachable red light. The picture uses the red light model for both illustrations, but the layouts are correct. The blue light picture is on top, and the red light photo is below it. If your 2:90 does not look like the picture, it is a blue light and the top picture is your ticket, and the same as Triaxtasy's.

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Roadster, Mark IV, Traditional/ Stiletto 412
Gone: Quad MIDI Pre, TriAxis V1 & V2, Formula Pre, Simul-Class 2:NINETY, 20/20 Stereo
Great deals with: Prestige20, DMTransmutation, PaxMan, Forty6and2, jdurso
WTB: Modded MTS modules


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PostPosted: Mon Dec 29, 2014 12:08 pm 
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Bottle Rocket

Joined: Mon Dec 27, 2010 7:36 am
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Thanks for the clarification JMMP!


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PostPosted: Wed Nov 23, 2016 12:46 pm 
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Bottle Rocket

Joined: Sat Aug 23, 2008 3:56 am
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Location: Fields of Flanders
Excellent job, Triaxstasy :shock:

Any tips on how to get to the underside of that pcb ? Do you have to unsolder everything ?


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