EIMAC 304TH/VT254 Medium-mu Triode (High-Power/Multi-Use Vacuum Tube)

Circa 1954

A high-power, medium-mu transmitting triode. Notably, it is essentially four separate triode units connected in parallel within a single glass envelope—essentially four powerful vacuum tubes packed into one glass bulb. It acts like a high-speed switch or a massive volume booster for radio and audio signals.

The Eimac 304TH (VT-254) was engineered for environments requiring high-power handling and reliability under significant thermal stress. Its multi-unit design allows it to function effectively in both historical military operations and specialized modern technical setups. NOTE: this is a fragile item that requires care in handling and use.

Historical & Military Environments

• Military Communications: Extensively used during World War II in high-power transmitters for aviation and maritime ground stations. Its rugged design allowed it to operate in extreme conditions, often exceeding 20,000 hours of service.

• Radar & Early Computing: Provided the RF power necessary for early radar systems and served as a high-power switching or amplification component in first-generation analog and digital computers.

Industrial & Scientific Use Cases

• RF Generation: Used in industrial platforms for RF heating and energy delivery.

• Scientific Research: Historically used in physics departments to drive radio-frequency gas discharges for spectroscopy studies.

• Broadcast Transmitters: Served as a modulator or power amplifier in radio broadcast equipment.

Modern "New Old Stock" (NOS) Applications

Today, these tubes are primarily sought after by enthusiasts for:

• High-Power Audio: Audiophiles use them in custom high-end or "funky" bass amplifiers due to their unique "holographic" sound characteristics and ability to deliver massive output power.

• Amateur Radio (Ham): Used in the maintenance of legacy linear amplifiers and transmitter systems. 

NOTE: 2-Units available.

(H-19cm x W-8cm x D-8cm)