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ID = 58012
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Transmitting Triode, air cooled   UHF 
Identical to TD04-20C
Similar Tubes
Normally replaceable-slightly different:
Other class quality (otherwise equal):
  CV397 ; DET24 ; TD04-20

Base COAXIAL in general (X..)
Filament Vf 6.3 Volts / If 1 Ampere / Half indirect
Description Special Quality or selected version of the TD04-20. Tested for Microphony and vibration effects.

RF power amplifier or oscillator.

Pa <20W, Va <400V, Ia <150mA. gm 10mA/V.

Typical output 13.5W at 1000MHz. Usable to 2000MHz. 

Information source - - Manufacturers Literature   Mullard 1964
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