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PostPosted: Tue Jan 23, 2018 7:41 pm 
Bottle Rocket

Joined: Thu Feb 28, 2013 3:11 am
Posts: 16
I own the 2:50. I listed the other amps assuming they are all somewhat similar on the inside.

I am ordering new power tubes soon from Mesa. I have owned the amp since about 2003 or a bit longer. During my ownership I have never opened it up. It is probably due for a cleaning to get rid of the years of dust, change the internal tubes, maybe install a quieter fan and finally install a fan switch.

Here are my questions.

Are those SPax7 tubes a good idea for the internal tube position?

Any safety concerns when opening the amp? I know about the capacitors, is there anything else?

As long as I have it open are there any mods I might consider?

I like the idea of running 6v6 tubes. Is a bias mod a good idea?

Thanks much.

PostPosted: Thu Jan 25, 2018 5:15 pm 
Mark II
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Joined: Sat Mar 21, 2009 3:12 pm
Posts: 57
Location: Finland
I had Stereo 2:50 power amp for 12 years. I installed NOS Mullard 12AT7 tubes in there, for input (phase inverter) and for presence tubes. It helped to have better/slower raise in volume pot. Not so much didn’t like in presence tubes. But my memory is now fading away abiut other changes, if there were any. Just to let you know that at home use it was good to have lower gain tube at first slot of the power amp.

Mesa Roadking (2002)&Mesa TriAxis (2015), Recto 4x12
Single Recto (2010), 2x12 Vertical
- past -
Triaxis 2.0 Recto-board
Recto Pre
Mark V

PostPosted: Wed Feb 14, 2018 3:03 am 
Bottle Rocket

Joined: Mon Jul 18, 2011 6:11 pm
Posts: 18
I did that too 12AT7, and I think I did that to the studio pre too. it just gives me a wider range of control over the area where my tonal prefs. live, otherwise for me it saturates too much too quickly....

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