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ID = 21997
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Tube type:  Screen-grid Tetrode   Text 
Identical to QBL5/3500 = 6076

Base OTHER TUBEBASE in general
Filament Vf 6.3 Volts / If 32.5 Ampere / Direct / Parallel, (AC/DC) /
Description This tube is a tetrode transmitting type, used as a high frequency amplifier, modulator or frequency multiplier, for narrow and broad band television. It requires 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
Literature - - Manufacturers Literature   Philips data sheet dated october 10th, 1955

QBL5/3500: E.R.
Ernst Rykkje

QBL5/3500: Valvo,Senderöhren, 1983
Anonymous 15 Collector

QBL5/3500: Valvo,Senderöhren, 1983
Anonymous 15 Collector

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