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Reporting question for Vacuum Tube - 5AR4 / GZ34, JJ Electronics

Product:
Vacuum Tube - 5AR4 / GZ34, JJ Electronics

Question:
I have a Fender Vibrolux amp. Want to change the 5u4gb with a 5ar4 rectifier. Will it be ok?

Answer:
According to our tube substitution handbook, the 5AR4 is not a substitute for the 5U4GB.