The 304TL saw service during World War II and afterward as a modulator tube in radar sets. It has enormous filament emission and plate current capabilities. The plate resistance is in the 1,000 to 1,500 ohm range, depending on operating point. A pair of 304TLs in push-pull class A service can deliver over 700 watts of audio power at 3,000 volts. A single 304TL in class A service will deliver over 40 watts, depending on choice of operating conditions and plate load. The maximum rated plate dissapation is 300 W. The filament requirements of the 304TL are either 5 V at 25 A or 10 V at 12.5 A.