11-14-11: Dodgealum
I'm trying to persuade Sophia Electric to make a 5AR4/GZ34 rectifier tube that would replace the Mullard NOS in my Modwright LS100.
Just to be on the safe side, don't try a 5AR4 in an amp that calls for a 5R4. The 5R4 can handle more voltage, so stay with the one the manufacturer of the amp recommends.