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ID = 21998
Tube type:  Transmitting Tetrode, air cooled   Power/Output 
Identical to 6076 = QBL5/3500 = 4F3-TR
First Source (s)
18.Sep.1953 : Electron Tube Registration List 1237

Base Super Giant 4 pin for transmitting
Was used by Transmittertube (Radio)
Filament Vf 6.3 Volts / If 32.5 Ampere / Direct / Parallel, (AC/DC)

Integral radiator transmitting tetrode; 3KW anode dissipation. 220MHz max freq. 'A' suffix for cermet version.
Made by Marconi and Philips, also with its owned marks, Amperex, Dario, Mullard, Valvo. Also Fivre.
RMA registration code assigned to Amperex. It is used as a high frequency amplifier, modulator or frequency multiplier in television. It operates with forced air cooling.

Dimensions (WHD)
incl. pins / tip
x 177 x 97 mm / x 6.97 x 3.82 inch
Weight 2250 g / 79.37 oz
Information source Tube Lore (I)   
- - Manufacturers Literature
6076: Private collection
Emilio Ciardiello

6076: Valvo,Senderöhren, 1983
Anonymous 15 Collector

6076: Valvo,Senderöhren, 1983
Anonymous 15 Collector

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