DA30 GEC audio output valves DO30 NR56, ribbed plate black and brown base for stereo sound

Description

The DA30 by GEC Osram is a triode for use in the output stage of amplifiers where a considerable undistorted power is required without recourse to the application of high HT voltages.

The main application for a DA3o or DO30 valve is to work in push-pull amplifiers in which a pair of valves are employed under condition which allow for a considerable undistorted power output by adjustment of the anode to anode load impedance to a lower value than the normal figure for class A operation.

Filament Volts 4

Filament current 2 Amps

Anode Volts 500 Max

Grid -134

Anode Current 60mA

Anode dissipation 30 Watts

mA/V 3.5

Both valves tested at 58mA and 57mA 100% emission.