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ID = 39092
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Developer: MO Valve Co. Ltd.; GB 
Tube type:  Triode, vacuum   VHF 
Identical to YD1400
Similar Tubes
Other base and data slightly different:

Base Noval, 9 pin miniature (USA pico-9) B9A Wires only.
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Parallel / series AC/DC
Description Va <500, Pa <3.5W; Flying lead, special quality version of the A2521

This was the last of the classic MOV designs. They were used as a cascode pair as the front end of the UK Clansman army radio which dates from the 1960s. Although transistors could have met the noise figures they were not robust enough to operate reliably in proximity to the transmitter. The YD1400 was developed for this equipment and proved a very reliable device being manufactured until 1986.
Information source - - Manufacturers Literature   
YD1400: AH eigene Sammlung
Alexander Hofer

YD1400: AH eigene Sammlung
Alexander Hofer


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