Sensibly equivalent¶ to:
The DA41 is a magnificent audio triode that was designed for high power use. In class B a pair would deliver 175 Watts at 5% distortion.
This exhibit has a carbon anode and a thoriated tungsten filament and the design dates to 1939. The later DA42 has an indirectly heated oxide cathode.
The signal input would be 220 Volts peak to peak between the two grids. The anode load would be 7,000 Ohms.
It is quite possible that the main use for this device would have been PA systems or modulators for small AM transmitters.
The balloon envelope is 48 mm in diameter and, excluding the UX4 base pins, is 132 mm tall.
References: Datasheet & 1005. Type DA41 was first introduced in 1939.
Absolute Maximum Operating Conditions¶
Updated July 05, 2014.