Mesa 50/50 which preamp tubes feed channel A and B and PI

Triaxis, Quad Preamp, Stereo Power series, Recto Preamp

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jonamojo
Mark I
Posts: 31
Joined: Sun Feb 21, 2010 1:58 am
Location: orange county, CA

Mesa 50/50 which preamp tubes feed channel A and B and PI

Post by jonamojo » Tue Jun 14, 2011 3:05 pm

Hi I want to change the preamp tubes but am unsure as to which tube belongs to which channel. The amp is an older 50/50 built in 1989ImageImageImage thanks in advance for your replys.....J

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crane
Mark III
Posts: 483
Joined: Fri May 09, 2008 4:22 am

Re: Mesa 50/50 which preamp tubes feed channel A and B and PI

Post by crane » Tue Jun 14, 2011 3:20 pm

The tube on the right of the photo is the input tube, each half for a channel.
The two on the left are PIs.
PRS McCarty Soapbar with BKP Pigs90, PRS custom 22 with BKP Rebel Yell
Mark V Head, 1x12" Mesa 1/2 closed (EVM-12L)
Triaxis 2.0 noFat - Quad preamp
Deep modded 20:20 - Bias modded 50/50 - SimulClass 295
Home made amps/speakers/pedals

jonamojo
Mark I
Posts: 31
Joined: Sun Feb 21, 2010 1:58 am
Location: orange county, CA

Re: Mesa 50/50 which preamp tubes feed channel A and B and PI

Post by jonamojo » Tue Jun 14, 2011 3:37 pm

Thank you very much for your quick reply Gonna change the PI's to NOS Telefunkens.

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