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ID = 78059
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Double Beam Power Tube   beam power   VHF 
Identical to CV2666 = QQV07-40 = 829B

Base Septar (1+6 pins) 2 Top contacts.
Was used by Transmittertube (Radio)
Filament Vf 12.6 Volts / If 1.25 Ampere / Indirect / Parallel, (AC/DC)

Dual tetrode for use up to 250 MHz.

Pa <20W per anode.

Centre-tapped heater for use at 6.3V

Information source - - Manufacturers Literature   

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