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Vox AC30CC2 5AR4 replace

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bi7340aa:
 Hi all!
Does any of the forum members have experience replacing the rectifier on a 5U4G?

roseblood11:
Voltages will be a bit lower.
I'd recommend to stay with the GZ34. Add rectifier diodes in series (1n4007 or better), and never use the standby switch. Leave it on or remove it completely.

Helmholtz:
Not a good idea to use a 5U4G in an AC30.
Heater current of 5U4G is 3A, GZ34 is 1.9A.
So the 5V heater winding will overheat.

bi7340aa:
Thanks, I know that the filament current 5U4 is 3 A.
But I don’t know what current the 5V winding is designed for...
The transformer for AC30 from Inmаdout, for example, is rated at 3A...

Helmholtz:

--- Zitat von: bi7340aa am 26.11.2023 16:10 ---But I don’t know what current the 5V winding is designed for...

--- Ende Zitat ---

I don't know either, but it seems unlikely that the original Vox PT could safely handle a 60% increased current.

Another benefit of the GZ34 is its delayed heat-up, resulting in delayed ramp-up of B+.
This saves tube life.

Why don't you want to use the GZ34?

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