The RCA 2C39A is a high-mu planar triode vacuum tube, engineered for ultra-high frequency (UHF) applications up to 2.5 GHz. Its compact, “oil-can” design features a disc-seal construction with glass envelope parts, ensuring minimal interelectrode capacitance and inductance, which is crucial for high-frequency performance.
A prominent feature of the 2C39A is its external heat sink fins connected to the anode, facilitating efficient heat dissipation. This design allows the tube to handle up to 100 watts of anode dissipation with forced-air cooling. In operation, the tube is typically force-air cooled, but water cooling is also an option. In such cases, the heat sink assembly is enclosed in a watertight tube made of copper or brass.
The tube’s internal structure includes a heater and cathode assembly housed at the apex of a cone, with a circular metal mesh grid providing isolation between input and output. The anode is a solid bar connected to the heat sink, ensuring robust performance in demanding applications.
Measuring 32 mm in diameter and 47 mm in height, the 2C39A is suitable for integration into compact systems. Its specifications include a heater voltage of 6.3 volts at 1.0 ampere, a maximum anode voltage of 1000 volts, and a maximum anode current of 100 milliamperes. The tube is capable of delivering an output power of 20 watts at frequencies up to 2.4 GHz.
The RCA 2C39A is ideal for use in cavity-type circuits as an oscillator, frequency multiplier, or power amplifier in radio transmitting services. Its design ensures reliable performance in both military and commercial applications, including radar systems, communication equipment, and microwave test apparatus.
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