PX25 Marconi NT40 Audio Triode early PX25 type DET5 CV1223 equivalent pair power amplifier triodes tested 100%

Description

The NT40 is a power amplifier triode a CV designation of UK Navy.

Has a special anode box which is made of molybdenum.

Unlike the PX25, the NT40 is capable to operate at 600 Volts anode, hence making it  versatile for audio purposes.

Valves feature ribbed plate, large getter with all filaments perfectly hooked up, excellent sound with code on glass .

In mint excellent condition and working order

Tested with AVO VCM 163

NT40 DET 5 {1} 68mA 100% emission mA/V 7.4

NT40 DET 5 {2} 69mA 100% emission mA/V 7.5