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

jonamojo · Jun 14, 2011

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 1989

thanks in advance for your replys.....J

crane · Jun 14, 2011

The tube on the right of the photo is the input tube, each half for a channel.
The two on the left are PIs.

jonamojo · Jun 14, 2011

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

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