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ID = 15767
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Transmitting Triode, air cooled   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to DO60 = DA60 = 660T = MZ05-60 = ES60
Similar Tubes
Normally replaceable-slightly different:

Base L4 British large 4 pin (1922, LG4) (Codex=Bo)
Was used by Transmittertube (Radio)
Filament Vf 6 Volts / If 4 Ampere / Direct / Parallel, (AC/DC)

Designed for Public Address amplifiers.
Large (L4) Base.

Power output 12W. Va <500, 3.5mA/V, Ra 1000 ohms.

Dimensions (WHD)
incl. pins / tip
80 x 205 x mm / 3.15 x 8.07 x inch
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   Advertisement August 1931
Babani, International Radio Tube Encyclopaedia
DO60: Fin Stewart
Fin Stewart


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