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GL-4D21/4-125A

Type: Tetrode
Frequency: 120 MHz
Class: C
Max power output: CW: 500 W, AM: 380 W (both max input)
Drive power: CW: 2.5 W, AM: 3.3 W
Heater voltage: 5 V
Heater current: 6.5 A
Plate voltage: 3000 V
Plate current: 225 mA
Plate dissipation: 125 W
Screen voltage: 400 V
Manufactured: 1947-19xx
Other: Requires some amount of forced air cooling
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