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ID = 81104
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  High-vacuum Rectifier 
Identical to TY86F
Similar Tubes
Heater different:

Base Noval, 9 pin miniature (USA pico-9) B9A Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 7.4 Volts / If 0.077 Ampere / Half indirect / Specified voltage AC/DC

TY86F – 7.4 V, 77 mA heater version of the EY86 18-kV CRT EHT rectifier, for use as a hotfix in early-production Ferguson Radio Corporation TV receivers 306T and 308T where the horizontal-output transformer produced excessive heater voltage which destroyed the originally fitted EY86s.[Wikipedia]

306T receiver with serial numbers: 1001 to 93150
308T receiver with serial numbers: 1001 to 26530

Dimensions (WHD)
incl. pins / tip
20 x 73 x mm / 0.79 x 2.87 x inch
Information source - - Manufacturers Literature   Mullard Data-Book 1963/64
TY86F: AH eigene Sammlung
Alexander Hofer

TY86F: AH eigene Sammlung
Alexander Hofer

TY86F: Mullard Data-Book, 1963/64
Anonymous 15 Collector

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