New-Old-Stock (NOS) tube.

The 4D32 is a beam type aligned grid power amplifier. It has a unipotential oxide-coated cathode, a hard glass nonex bulb, and a glass base with short tungsten leads. The tube has a heater designed to operate from a 6.3 volt supply. Mechanically, this tube has been ruggedized to withstand the shock and vibration encountered in mobile and aircraft applications. A single tube may be operated as a "Class C" RF amplifier up to 60 megacycles without neutralization and without reducing the plate input power ratings. With a 600-volt plate supply and 1.25 watts grid driving power, a single tube will produce 125 watts output. The tube may also be used as an oscillator, frequency multiplier, or plate modulated RF amplifier.