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ID = 58874
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Tube type:  Triode, vacuum   Audio Frequency 
Identical to A1178
Similar Tubes
Normally replaceable-slightly different:

Base Europe side contact P8A (Au P, 8SC) Side contacts.
Filament Vf 4 Volts / If 0.25 Ampere

Special for microphone amplifiers. Gm=2.8mA/V. Amp Factor=25, Z=9k, Va<150.

Designed as a replacement for the A537

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