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ID = 27390
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Damper, booster, flyback diode 
Identical to KY80 = U26
Similar Tubes
Normally replaceable-slightly different:

Base Noval, 9 pin miniature (USA pico-9) B9A Top contact with a cap.
Filament Vf 2 Volts / If 0.35 Ampere / Indirect
Dimensions (WHD)
incl. pins / tip
21 x 76 x mm / 0.83 x 2.99 x inch
Weight 20 g / 0.71 oz
Information source -- Collector info (Sammler)   
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ky80_so.png KY80: rtt
Anonymous 10 Collector

Just Qvigstad

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