Preamp tube positions on M4 and modules

ugg

New member
Apologies if this has been asked before...

Facing the back of the M4, what function do the upper left and lower right tubes serve? Do the tubes need to be matched and/or balanced?

Facing the front of a module, which tube has more effect on tone, left or right?

Last question, facing the back of the Randall RT2/50, which tube is the phase inverter tube? (left, middle, or right?)

Thanks!
 
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