Power - Triode vacuum tubes

Triode

Mesh-plate directly heated 300B-family audio power triode. Its distinctive mesh anode accompanies traditional low-mu, low-plate-resistance characteristics and plate dissipation in the mid-30-watt range for single-ended Class A output stages.

Base

UX4

Socket

UX4

Heater

5 V

Sections

1

Triode

Higher-power directly heated development of the 300B family for demanding Class A audio output stages. Increased plate-voltage, current, and approximately 60 W dissipation capability extend operation substantially beyond conventional 300B limits.

Base

UX4

Socket

UX4

Heater

5 V

Sections

1

Triode

Heavy-duty directly heated 300B-family audio triode for substantially higher Class A output. Approximately 60 W plate dissipation, elevated plate-voltage capability, and higher operating current extend the familiar low-mu 300B concept into more powerful stages.

Base

UX4

Socket

UX4

Heater

5 V

Sections

1

Triode

Directly heated output triode for receiver audio power service, providing single-ended power amplification from early receiving-equipment supply voltages.

Base

4D

Socket

UX4

Heater

2 V

Sections

1

Triode

Compact directly heated transmitting triode for UHF oscillator and RF power-amplifier service. Low interelectrode capacitance and approximately 20 W plate dissipation permit full-rating operation to about 400 MHz with several watts of RF output.

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Socket

SMALL5

Heater

2 V

Sections

1

Triode

Eimac 3-200A3, explicitly cross-designated with type 592, is a medium-mu power triode for substantial RF and power-amplifier service.

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Heater

10 V

Sections

1

Triode

Higher-current 300B-XLS-family directly heated audio power triode, also specified as a replacement for type 842. Roughly 55 W continuous plate dissipation and high-current Class A operation permit substantially greater single-tube output than a conventional 300B.

Base

UX4

Socket

UX4

Heater

5 V

Sections

1

Triode-Triode

Twin power triode containing two identical sections for high-frequency RF amplification. The paired systems provide compact push-pull transmitter operation, with published output around 14 W and useful service extending to approximately 300 MHz.

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Socket

MEDIUM7

Heater

6.3 V

Sections

2

Triode-Triode

Twin power triode with identical sections usable in parallel or push-pull audio and RF stages. Published conditions cover Class A and Class B audio output as well as Class C transmitting service around 14 W.

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Socket

MEDIUM7

Heater

6.3 V

Sections

2

Triode

Western Electric directly heated air-cooled transmitting triode for Class C RF power and plate-modulated service. Its 60 W plate dissipation and 1.5 kV capability suit moderate-power radio transmitters.

Base

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Socket

B4A

Heater

5 V

Sections

1

Triode

High-mu transmitting triode for Class B and Class C RF operation and audio-modulator service. With roughly 50 W plate dissipation and 2 kV plate capability, it provides versatile medium-power transmitter and modulation service.

Base

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Socket

MEDIUM4BAYONET

Heater

5 V

Sections

1

Triode

Eimac high-mu transmitting triode for modulator, oscillator, and amplifier service. Its roughly 50 W plate dissipation and 2 kV plate rating provide useful medium-power capability in both RF transmitter and audio-frequency modulator stages.

Base

Not recorded

Socket

UX4

Heater

5 V

Sections

1

Triode

Western Electric directly heated air-cooled transmitting triode for Class C RF and plate-modulated service. Approximately 50 W plate dissipation and 1.5 kV plate capability make it suitable for moderate-power communications transmitters.

Base

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Socket

Not recorded

Heater

5 V

Sections

1

Triode

Forced-air-cooled water-filament high-power transmitting triode designed for Class C radio-frequency power service in substantial transmitter equipment.

Base

Not recorded

Socket

Not recorded

Heater

11 V

Sections

1

Triode

Directly heated power triode for moderate audio or RF output service. Its low plate resistance, amplification factor around seven, 15 W plate dissipation, and 400 V plate capability suit general-purpose power amplification.

Base

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Socket

MEDIUM4BAYONET

Heater

4.5 V

Sections

1

Triode

Power triode intended for audio-frequency and radio-frequency service. Low plate resistance, moderate amplification factor, 25 W plate dissipation, and 600 V plate capability provide useful current capacity for driver, output, and transmitter stages.

Base

Not recorded

Socket

B5

Heater

6 V

Sections

1

Triode

Double-disc-seal UHF power triode for high-frequency transmitting service. Low-inductance electrode connections, approximately 40 W plate dissipation, and kilovolt plate capability suit compact RF power stages where conventional lead structures become limiting.

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Socket

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Heater

6.3 V

Sections

1

Triode

Double-disc-seal UHF transmitting triode of the 3B401J family. Its low-inductance construction, approximately 40 W plate dissipation, and kilovolt plate rating are optimized for high-frequency RF power operation.

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Socket

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Heater

6.3 V

Sections

1

Triode

RF power triode designed for full-input transmitting operation to approximately 100 MHz. Its relatively high amplification factor, 50 W plate dissipation, and 1.5 kV plate capability provide moderate RF power with useful voltage gain.

Base

Not recorded

Socket

Not recorded

Heater

5 V

Sections

1

Triode

Power triode intended for both audio-frequency and radio-frequency service. Low plate resistance, 100 W plate dissipation, and 1.25 kV plate capability provide substantial medium-power performance for output, modulator, and transmitter applications.

Base

Not recorded

Socket

LARGE4BAYONET

Heater

10 V

Sections

1

Triode

Indirectly heated power triode designed for audio-frequency output service. Its moderate amplification factor, approximately 10 W plate dissipation, and low plate-voltage rating provide loudspeaker-driving power from a heater-cathode construction rather than a directly heated filament.

Base

Not recorded

Socket

B5

Heater

4 V

Sections

1

Triode

Oxide-coated filament power triode documented for power service. The available manufacturer source gives triode characteristics and interelectrode capacitances but is comparatively sparse about a narrower specialized application.

Base

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Socket

MEDIUM4BAYONET

Heater

4.5 V

Sections

1

Triode

Disk-seal transmitting triode for RF power amplification and pulsed or continuous-wave oscillator service.

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Socket

Not recorded

Heater

6.3 V

Sections

1

Triode

Medium-mu Eimac power triode for amplifier, oscillator, and modulator service. It operates at full ratings to about 60 MHz and has published Class-C RF and Class-AB/B modulator operating conditions.

Base

Not recorded

Socket

UX4

Heater

6.3 V

Sections

1

Triode

Airtron 3C28 directly heated thoriated-tungsten high-frequency transmitting power triode, 6.3 V 3 A filament, 25 W plate dissipation and up to 100 MHz full-power Class C RF service.

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Socket

Not recorded

Heater

6.3 V

Sections

1

Triode

Hytron 3C30 directly heated high-mu 25 W power triode with thoriated-tungsten 5.6 V 2.5 A filament, 850 V maximum plate voltage, and plate top cap.

Base

Not recorded

Socket

MEDIUM4BAYONET

Heater

5.6 V

Sections

1

Triode-Triode

Twin high-perveance power triode developed for industrial control-amplifier and voltage-regulator service, combining two power sections suited to substantial current handling and series-pass regulation.

Base

Not recorded

Socket

SEPTAR7

Heater

12.6 V

Sections

2

Triode

Heintz & Kaufman 3C34 directly heated thoriated-tungsten transmitting power triode for RF amplification, oscillation and Class B audio modulation, with 6.3 V 3 A filament and 25 W plate dissipation.

Base

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Socket

Not recorded

Heater

6.3 V

Sections

1

Triode

Ceramic-metal industrial power triode designed for high-power RF amplifier, oscillator, or modulator service. Manufacturer data emphasize transmitting duty, substantial plate dissipation, and the cooling provisions required for continuous professional operation.

Base

Not recorded

Socket

Not recorded

Heater

6 V

Sections

1

Triode

Ceramic-metal industrial power triode designed for high-power RF amplifier, oscillator, or modulator service. Manufacturer data emphasize transmitting duty, substantial plate dissipation, and the cooling provisions required for continuous professional operation.

Base

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Socket

Not recorded

Heater

26.5 V

Sections

1

Triode

Directly heated transmitting triode for RF amplification and oscillator service. Published Class C operation provides about 200 W RF output, with full ratings to approximately 150 MHz and reduced ratings to 250 MHz.

Base

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Socket

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Heater

7.5 V

Sections

1

Triode

Directly heated transmitting triode for RF and audio-frequency power amplification. Published operation provides roughly 113 W Class C RF output or about 205 W Class B audio output, with operation to approximately 150 MHz.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Triode

Small transmitting power triode intended for oscillator, RF power-amplifier, AF power-amplifier, and modulator service. Its published ratings cover both radio-frequency generation and audio/modulation duties.

Base

Not recorded

Socket

Not recorded

Heater

7.5 V

Sections

1

Triode

Directly heated transmitting triode for radio-frequency power amplification.

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Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Triode

Indirectly heated oxide-cathode power triode for Class A and Class B audio amplification and RF service. Low plate resistance, moderate amplification factor, 25 W plate dissipation, and 600 V capability make it a versatile general-purpose power device.

Base

Not recorded

Socket

B5

Heater

6 V

Sections

1

Triode

Indirectly heated oxide-cathode power triode for Class A and Class B audio amplification and RF service. It combines low plate resistance with approximately 25 W plate dissipation and 600 V plate capability for general power-amplifier applications.

Base

Not recorded

Socket

MEDIUM5

Heater

6 V

Sections

1

Triode

Special-test version of the indirectly heated 4033 power triode selected for demanding aircraft-radio service. It retains the parent type's low plate resistance, 25 W plate dissipation, and 600 V capability while emphasizing aviation equipment use.

Base

Not recorded

Socket

MEDIUM5

Heater

6 V

Sections

1

Triode

Cross-designation and replacement form of the 3B252B power triode for audio and RF service. Its low plate resistance, moderate amplification factor, 25 W plate dissipation, and 600 V rating suit driver, output, and transmitter stages.

Base

Not recorded

Socket

B5

Heater

6 V

Sections

1

Triode

Directly heated power triode for Class B audio or modulator service and RF operation. Its low plate resistance, 35 W plate dissipation, and 600 V plate capability support substantial power stages; later C/D versions improved grid behavior.

Base

Not recorded

Socket

B4

Heater

7.5 V

Sections

1

Triode

Directly heated power triode for Class B audio, modulator, and RF service. Published push-pull audio operation reaches about 60 W, while the type's 35 W plate dissipation and 600 V rating support moderate transmitter duty.

Base

Not recorded

Socket

B4

Heater

7.5 V

Sections

1

Triode

Improved directly heated triode for Class B audio, modulator, and RF service. A redesigned grid reduces grid emission and permits greater undistorted output, with published push-pull audio output around 73 W.

Base

Not recorded

Socket

B4

Heater

7.5 V

Sections

1

Triode

Improved directly heated power triode for Class B audio, modulator, and RF applications. Its grid was engineered to reduce grid emission and increase undistorted output while retaining the 4043 family's moderate-voltage power capability.

Base

Not recorded

Socket

B4

Heater

7.5 V

Sections

1

Triode

High-mu ceramic-metal pencil triode for plate-pulsed RF amplification, oscillation, and frequency multiplication. High transconductance, compact construction, and kilovolt pulse capability suit specialized high-frequency pulsed transmitter circuits.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Triode

Standard Valves transmitting triode sharing the 4056-A/4056-B specification, intended for RF power service with published limiting and operating data.

Base

Not recorded

Socket

LARGE4BAYONET

Heater

6 V

Sections

1

Triode

Standard Valves transmitting triode sharing the 4056-A/4056-B specification, intended for RF power service with published limiting and operating data.

Base

Not recorded

Socket

LARGE4BAYONET

Heater

6 V

Sections

1

Triode-Triode

Integrated dual-triode L-band oscillator-amplifier assembly specifically designed for 1090 MHz airborne transponder service. Separate oscillator and amplifier sections share one compact assembly, providing pulsed microwave transmission for aircraft identification equipment.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

2

Triode

High-mu ceramic-metal pencil triode for high-power pulsed RF service into the microwave region. Published pulse operation can produce roughly 600 W useful output from a compact structure with only about 10 W continuous plate dissipation.

Base

Not recorded

Socket

SPECIAL4LOWLOSS

Heater

12 V

Sections

1

Triode

L-band cavity pencil-tube oscillator designed for pulsed operation around 1090 MHz. Its specialized construction and high-voltage pulse ratings suit compact airborne transponder and identification transmitter systems rather than general-purpose power amplification.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1