DO30 Mullard red white label balloon valves DA30 V503 power output triodes class A

Description

The DO30 and the DA30 have much in common.

The DO30 is a large output triode and can be considered an uprated version of the PX25 having a wider grid.

The data for the DO30 refers as follow:

Output Triode

Voltage Filament 4

Filament Amps 2

Max Anode Volts 500

Anode mA60

Grid-134

Mutual Conductance mA/V 6.9

Both valves tested with AVO VCM 163

Mullard DO30 tested 63mA 100%

Mullard DO30 tested 65mA 100%