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ID = 56221
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Triode, vacuum   SHF/EHF (>3 GHz) 
Identical to TD03-10F
Similar Tubes
Normally replaceable-slightly different:
Predecessor Tubes TD03-10  

Base COAXIAL in general (X..)
Filament Vf 6.3 Volts / If 0.4 Ampere / Half indirect

Disc seal planar triode with internal feedback, intended for use in common-grid, grounded-anode coaxial oscillators.
250V at 20mA anode, with -3.5V grid bias. 6.0 mA/V Gm, gain 30. Up to 3 GHz operating frequency.

Information source - - Manufacturers Literature   
TD03-10F: Manufacturer's Literature
Emilio Ciardiello


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