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ID = 22422
Tube type:  Screen-grid Tetrode 
Identical to 8321 = QV2-350A = 4CX350A
Similar Tubes
Normally replaceable-slightly different:

Base SPECIAL TUBEBASE in general
Filament Vf 6.3 Volts / If 3.2 Ampere / Indirect
Weight 120 g / 4.23 oz
Information source

8321_so1.png 8321: ARRL Handbook 1972
Anonymous 10 Collector

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