EZ81 / 6CA4 / UU12

The EZ81 / 6CA4 / UU12 is a miniature 9-pin "noval" double anode rectifier tube. It has an indirect heater filament which, unlike other rectifier valves, can be run from the same 6.3V heater power supply as the other tubes in the amp. It is typically found in low power tube guitar amps below 20W.

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