Power - Triode vacuum tubes

Triode

Filamentary transmitting triode for radio-frequency amplifier and oscillator service. Manufacturer ratings and operating conditions identify it as an RF power device rather than a receiving or small-signal triode.

Base

UX4

Socket

UX4

Heater

5 V

Sections

1

Triode

Transmitting power triode intended for RF amplifier and oscillator operation. Its published service data center on radio-frequency power generation and the plate loading expected of an industrial transmitting tube.

Base

OCTAL

Socket

IO

Heater

5 V

Sections

1

Triode

Sylvania 210T power-amplifier triode, related to type 10.

Base

Not recorded

Socket

Not recorded

Heater

7.5 V

Sections

1

Triode

Filamentary transmitting triode intended for radio-frequency amplification and oscillation, with power-service operating data characteristic of the 211 family. It is a high-voltage power device rather than a receiving triode.

Base

Not recorded

Socket

JUMBO4B

Heater

10 V

Sections

1

Triode

Forced-air-cooled high-power transmitting triode for RF service. Published data specify forced-air anode cooling, multi-kilowatt plate dissipation, and operation into the low-megahertz range for industrial transmitting applications.

Base

Not recorded

Socket

MEDIUM4BAYONET

Heater

21.5 V

Sections

1

Triode

Two-volt super-power directly heated output triode for high-quality audio amplification in battery-operated receiving equipment.

Base

Not recorded

Socket

B4

Heater

Not recorded

Sections

1

Triode

Power transmitting triode intended for RF amplifier and oscillator operation, with manufacturer data centered on radio-frequency output and high-voltage plate service. It belongs functionally with transmitting power triodes.

Base

Not recorded

Socket

J4

Heater

10 V

Sections

1

Triode

Transmitting power triode for radio-frequency amplifier and oscillator duty. Its published operating conditions emphasize substantial RF output, plate input, and dissipation rather than low-level receiving applications.

Base

Not recorded

Socket

JUMBO4B

Heater

10 V

Sections

1

Triode

Filamentary transmitting power triode intended for RF amplification and oscillation. Manufacturer documentation provides power-service operating conditions characteristic of transmitter output or driver stages.

Base

Not recorded

Socket

J4

Heater

10 V

Sections

1

Triode

General-purpose Western Electric power triode with an oxide-coated filament and published Class-A operation. Its documented operating point provides roughly 7–8 W output, making audio-frequency power amplification a principal practical role.

Base

Not recorded

Socket

UX4

Heater

5 V

Sections

1

Triode

High-mu power triode designed for low-voltage audio output service. Manufacturer operating data shows dynamically coupled Class A use from about a 110 V plate supply, producing roughly 2.7 W with 10 W maximum plate dissipation.

Base

Not recorded

Socket

IO

Heater

25 V

Sections

1

Triode

High-mu audio-output power triode for low-voltage and transformerless receiver circuits. Published data includes dynamically coupled Class A operation and push-pull Class B service, where a pair can produce approximately 6 W.

Base

60

Socket

IO

Heater

25 V

Sections

1

Triode-Triode

Dual-triode dynamic-coupled power-output tube for high-quality audio in AC/DC receivers, combining driver and output functions in one envelope.

Base

6DA

Socket

UX6

Heater

25 V

Sections

2

Triode-Triode

Octal dual-triode dynamic-coupled power-output tube for high-quality AC/DC receiver audio, functionally corresponding to the 25B5.

Base

G-7WQ

Socket

IO

Heater

25 V

Sections

2

Triode

Eimac medium-mu transmitting power triode for audio-frequency amplifier or modulator duty and RF power-amplifier or oscillator service. Its 25 W plate dissipation and kilovolt-class plate ratings support compact transmitting applications.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Triode

Western Electric directly heated power triode for both audio and RF amplification. Published operation includes substantial single-ended Class A audio output and much higher push-pull Class B power, together with transmitting-frequency service.

Base

Not recorded

Socket

UX4

Heater

10 V

Sections

1

Triode

Western Electric power triode for transmitter and amplifier service, intended for substantial signal or power amplification.

Base

Not recorded

Socket

MEDIUM4BAYONET

Heater

10 V

Sections

1

Triode

Western Electric power triode for transmitter and amplifier service, with manufacturer operating data supporting power-stage use.

Base

Not recorded

Socket

MEDIUM4BAYONET

Heater

Not recorded

Sections

1

Triode

Western Electric thoriated-tungsten transmitting triode for Class-B RF service, with approximately 12.5 W catalog RF output.

Base

Not recorded

Socket

MEDIUM4BAYONET

Heater

5 V

Sections

1

Triode

Western Electric thoriated-tungsten transmitting triode for Class-B RF service, with approximately 175 W catalog RF output.

Base

Not recorded

Socket

MEDIUM4BAYONET

Heater

10 V

Sections

1

Triode

Directly heated Western Electric power triode intended for audio and radio-frequency transmitting applications. Its 100 W plate dissipation and 1.25 kV plate capability support substantial power stages, with full RF ratings into the tens-of-megahertz range.

Base

Not recorded

Socket

J4

Heater

7.5 V

Sections

1

Triode

Low-mu directly heated Western Electric power triode intended for high-current amplifier service. Its approximately 100 W plate dissipation, 1.25 kV plate capability, and low amplification factor suit substantial low-impedance power stages.

Base

Not recorded

Socket

J4

Heater

10 V

Sections

1

Triode

Low-mu directly heated Western Electric audio power triode for substantial single-ended Class A output. Manufacturer operating data supports about 40 W output from a 1.25 kV plate supply, with 100 W maximum plate dissipation.

Base

Not recorded

Socket

JUMBO4B

Heater

10 V

Sections

1

Triode

Medium-mu directly heated Western Electric power triode for Class B audio and RF service. A push-pull pair can deliver roughly 250 W, while its 100 W plate dissipation and high-voltage ratings also support transmitting applications.

Base

Not recorded

Socket

JUMBO4B

Heater

10 V

Sections

1

Triode

Water-cooled high-power Western Electric transmitting triode for Class-B RF service.

Base

Not recorded

Socket

Not recorded

Heater

27 V

Sections

1

Triode

Water-cooled high-power Western Electric transmitting-triode variant for substantial RF power service.

Base

Not recorded

Socket

Not recorded

Heater

27 V

Sections

1

Triode

Classic directly heated low-mu audio power triode for single-ended and push-pull output stages. Its low plate resistance, roughly 15 W plate dissipation, and typical 250 V operating conditions made it a standard high-quality audio output tube.

Base

4D

Socket

UX4

Heater

2.5 V

Sections

1

Triode

Directly heated filamentary power triode for moderate-power Class-A audio-frequency output service.

Base

Not recorded

Socket

Not recorded

Heater

2.5 V

Sections

1

Triode

Directly heated filamentary Class-A audio power triode with approximately 40 W maximum plate dissipation.

Base

Not recorded

Socket

UX4

Heater

2.5 V

Sections

1

Triode

Modern directly heated 2A3-family audio power triode for Class A output service. Published operation around 250 V provides roughly 3 W single-ended output, retaining the low-mu behavior and modest plate resistance characteristic of the 2A3 family.

Base

Not recorded

Socket

Not recorded

Heater

2.5 V

Sections

1

Triode

Heater-cathode triode power amplifier for audio output service, using a 2.5 V heater and substantial Class-A power capability.

Base

Not recorded

Socket

UX4

Heater

2.5 V

Sections

1

Triode

Mesh-plate directly heated 2A3-family audio power triode. It retains the classic low-mu operating character while using distinctive mesh-anode construction, with published single-ended Class A service producing roughly 3.5 W into a 2.5 kΩ load.

Base

UX4

Socket

UX4

Heater

2.5 V

Sections

1

Triode

Higher-rated directly heated 2A3-family audio power triode for Class A output stages. Increased plate-voltage and dissipation capability extends the traditional 2A3 operating range, with published conditions reaching roughly 9 W output.

Base

UX4

Socket

UX4

Heater

2.5 V

Sections

1

Triode

Compact dual power triode designed for RF transmitting service. Its two equivalent sections operate together as a power stage, with published conditions providing roughly 16 W RF output from modest drive and several-hundred-volt plate operation.

Base

Not recorded

Socket

MEDIUM7

Heater

6.3 V

Sections

2

Triode

Disk-seal transmitting triode for RF power amplification and oscillation through the UHF region.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Triode

High-mu ceramic-metal UHF transmitting triode for amplification, oscillation, and pulse service into the microwave region. Approximately 100 W plate dissipation and high transconductance support useful RF power at frequencies extending into the gigahertz range.

Base

Not recorded

Socket

SPECIAL4

Heater

6.3 V

Sections

1

Triode

Ceramic-metal UHF transmitting triode for continuous-wave amplifier, oscillator, and pulsed microwave service. Manufacturer data specifies useful CW operation to about 2.5 GHz and pulse applications to roughly 3 GHz, with 100 W plate dissipation.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Triode

Air-cooled metal-ceramic disc-seal power triode for microwave oscillators, modulators, power mixers, amplifiers, and frequency multipliers. Siemens documentation supports operation into the multi-gigahertz region from this compact high-transconductance structure.

Base

Not recorded

Socket

Not recorded

Heater

6 V

Sections

1

Triode

Ruggedized 2C39-family UHF transmitting triode for demanding military and professional equipment. Its high-transconductance ceramic-metal construction supports oscillator, multiplier, and power-amplifier operation into the microwave region while emphasizing resistance to severe service conditions.

Base

Not recorded

Socket

Not recorded

Heater

5.8 V

Sections

1

Triode

Improved 2C40-family microwave power triode for compact high-frequency oscillator and amplifier applications. Increased plate-dissipation capability extends the earlier lighthouse concept while retaining geometry suited to UHF and microwave resonant circuits.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Triode

High-mu planar power triode for plate-pulsed oscillators and RF power amplifiers from lower frequencies into the microwave region. Ring-seal construction minimizes inductance and capacitance for cavity and parallel-line circuits approaching 3 GHz.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Triode

General Electric 2C42 indirectly heated disk-seal UHF pulsed power oscillator triode rated for operation to 1.3 GHz, with 6.3 V 0.9 A heater and 3 kV peak anode rating.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Triode

RCA disk-seal lighthouse triode for RF power amplification and continuous-wave or pulsed oscillator service. Low interelectrode inductance and compact construction permit useful operation into the microwave region, including oscillation around 1.5 GHz.

Base

Not recorded

Socket

IO

Heater

6.3 V

Sections

1

Triode

Directly heated output power triode for final-stage amplification.

Base

Not recorded

Socket

Not recorded

Heater

2.5 V

Sections

1

Triode

Western Electric directly heated low-mu power triode designed for Class A audio-frequency output service. Low plate resistance and substantial plate dissipation make it suitable for transformer-coupled, high-quality audio power stages.

Base

Not recorded

Socket

UX4

Heater

5 V

Sections

1

Triode

Classic directly heated low-mu audio power triode developed for high-quality Class A amplification. Low plate resistance and roughly 40 W plate dissipation support transformer-coupled single-ended operation, with published output typically in the several-watt range.

Base

UX4

Socket

UX4

Heater

5 V

Sections

1

Triode

2.5 V-filament 300B-family mesh power triode intended for 2A3-like audio operating conditions. It combines low-mu, low-plate-resistance behavior with direct heating and provides several watts of single-ended Class A output.

Base

UX4

Socket

UX4

Heater

2.5 V

Sections

1

Triode

Electro-Harmonix directly heated 300B-family power triode for low-frequency Class A amplification. With roughly 40 W plate dissipation, published single-ended conditions provide several watts of audio output while retaining traditional low-mu 300B behavior.

Base

Not recorded

Socket

Not recorded

Heater

5 V

Sections

1