Power - Triode vacuum tubes

Triode

Directly heated receiving power triode for audio-frequency output service, with Class A operation to about 1.6 W single-ended and published push-pull Class B operation reaching roughly 25 W from a pair.

Base

4D

Socket

UX4

Heater

7.5 V

Sections

1

Triode

High-mu transmitting power triode for Class C RF amplification or oscillation and Class B audio/modulator service. Rated for 100 W plate dissipation, operation to about 40 MHz, and several hundred watts output under published conditions.

Base

Not recorded

Socket

MEDIUM4BAYONET

Heater

5 V

Sections

1

Triode

Low-mu Eimac transmitting power triode intended for RF amplifier, oscillator, and modulator service. Its published operating data cover substantial Class C RF output and audio/modulator operation at plate voltages up to several kilovolts.

Base

Not recorded

Socket

MEDIUM4BAYONET

Heater

5 V

Sections

1

Triode-Triode

Dissimilar dual triode combining a high-mu voltage-amplifier section with a low-mu 10 W power section, derived from the GF7 family for demanding driver and output applications.

Base

Not recorded

Socket

B9E

Heater

9.7 V

Sections

2

Triode

Directly heated RF power triode for radio-frequency amplifier and oscillator service in transmitting and professional high-frequency equipment.

Base

Not recorded

Socket

UX4

Heater

7.5 V

Sections

1

Triode

Radiation-cooled Amperex transmitting triode for RF power amplification and oscillation, with Class B audio-amplifier or modulator service also specified. Rated for 75 W plate dissipation and operation to approximately 30 MHz.

Base

Not recorded

Socket

Not recorded

Heater

10 V

Sections

1

Triode-Triode

Dual low-mu power triode designed for booster-scanning circuits and series-regulator service in DC power supplies. Its sections withstand severe pulse conditions, including kilovolt-level inverse and control-grid pulse voltages.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

2

Triode-Triode

Dissimilar dual triode, electrically equivalent to 6FY7/15FY7 apart from heater characteristics, combining a high-mu section with a low-mu, pulse-capable power output section.

Base

12E0

Socket

B12C

Heater

11 V

Sections

2

Triode

Modern directly heated audio power triode intended for single-ended amplifier service. Published operation at 500 V and 50 mA produces about 4.1 W into a 5 kΩ load, with 25 W maximum plate dissipation.

Base

UX4

Socket

UX4

Heater

5 V

Sections

1

Triode

Directly heated graphite-anode radiation-cooled triode for RF heating, modulation, and transmitting service, using a thoriated-tungsten filament for substantial industrial RF power.

Base

Not recorded

Socket

Not recorded

Heater

5 V

Sections

1

Triode

Forced-air-cooled medium-mu high-vacuum transmitting triode for high-power RF amplification, oscillator, and modulator service in professional transmitting equipment.

Base

Not recorded

Socket

SPECIAL4

Heater

7.5 V

Sections

1

Triode

Three-electrode transmitting triode for Class B/C RF power amplification, Class C oscillator operation, and Class B modulation.

Base

Not recorded

Socket

Not recorded

Heater

10 V

Sections

1

Triode

Medium-mu power triode for audio-frequency power amplification or modulation and radio-frequency power-amplifier or oscillator service.

Base

Not recorded

Socket

SPECIAL4

Heater

10 V

Sections

1

Triode

Low-mu power triode for audio-frequency and radio-frequency amplification, oscillator operation, and modulator service in transmitting equipment.

Base

Not recorded

Socket

SPECIAL4

Heater

10 V

Sections

1

Triode

High-power three-electrode transmitting triode for Class B/C RF power amplification, Class C oscillator operation, and Class B modulator service.

Base

Not recorded

Socket

Not recorded

Heater

10 V

Sections

1

Triode

Directly heated graphite-anode radiation-cooled triode designed specifically for industrial RF-heating equipment, using a thoriated-tungsten filament for substantial high-frequency power.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Triode

Directly heated forced-air-cooled triode designed specifically for industrial RF-heating equipment, using a thoriated-tungsten filament for substantial continuous high-frequency power.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Triode

Directly heated water-cooled triode designed specifically for industrial RF-heating equipment, using a thoriated-tungsten filament for substantial continuous high-frequency power.

Base

Not recorded

Socket

Not recorded

Heater

5 V

Sections

1

Triode

Directly heated vapor-cooled triode designed specifically for industrial RF-heating equipment, with full-rating operation documented to approximately 60 MHz.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Triode

Directly heated amplifier triode developed for critical audio-frequency applications where low microphonics are important. Rated for 15 W plate dissipation, it combines power-triode capability with construction intended to reduce mechanically induced signal disturbance.

Base

Not recorded

Socket

MEDIUM4BAYONET

Heater

7.5 V

Sections

1

Triode

High-power directly heated audio triode related to the PX25 family. Published Class A operation at 580 V and 110 mA produces about 22 W into a 2.7 kΩ load, with 64 W maximum plate dissipation.

Base

UX4

Socket

UX4

Heater

5 V

Sections

1

Triode

Cathode-tapped V4 version of the directly heated 1605 high-power audio triode. Published Class A conditions specify about 22 W output at 580 V and 110 mA, with a 64 W maximum plate-dissipation rating.

Base

OCTAL

Socket

IO

Heater

5 V

Sections

1

Triode

RCA transmitting power triode for RF power and oscillator service, with Class B audio/modulator operation also specified. Rated for 20 W plate dissipation and full-rating high-frequency operation to approximately 45 MHz.

Base

Not recorded

Socket

UX4

Heater

2.5 V

Sections

1

Triode

Transmitting power triode intended for AF and RF power amplification, Class B modulation, and oscillator service. Published Class B intermittent-service conditions reach roughly 145 W maximum-signal output.

Base

Not recorded

Socket

UX4

Heater

6.3 V

Sections

1

Triode-Triode

High-mu twin triode intended for audio amplification and Class-B power-amplifier service, combining two triode units in one envelope for push-pull output operation.

Base

8B

Socket

IO

Heater

6.3 V

Sections

2

Triode

High-power three-electrode transmitting triode for Class B/C RF power amplification, Class C oscillator operation, and Class B modulation.

Base

Not recorded

Socket

Not recorded

Heater

Not recorded

Sections

1

Triode

Directly heated forced-air-cooled transmitting triode with thoriated-tungsten filament, designed for substantial RF transmitter service and direct filament switching.

Base

Not recorded

Socket

Not recorded

Heater

8 V

Sections

1

Triode

Directly heated water-cooled triode with integral cooling for industrial induction-heating equipment, using a thoriated-tungsten filament suitable for direct switching.

Base

Not recorded

Socket

Not recorded

Heater

8 V

Sections

1

Triode

Directly heated power triode documented in AEI industrial-valve literature; available source evidence supports industrial high-power service but not a narrower application statement without speculation.

Base

Not recorded

Socket

Not recorded

Heater

8 V

Sections

1

Triode

Directly heated low-load-resistance power-amplifier triode retained as a replacement type for older Sparton receivers, intended for receiver audio-output service.

Base

D

Socket

Not recorded

Heater

5 V

Sections

1

Triode

Directly heated low-load-resistance power-amplifier triode retained as a replacement type for older Sparton receivers. Published Class A operation uses about 250 V plate supply and provides approximately 1.8 W output.

Base

4D

Socket

Not recorded

Heater

5 V

Sections

1

Triode-Triode

Twin triode designed as a Class-B push-pull power amplifier for battery receivers, with the two triode units operated together to deliver approximately two watts of audio output.

Base

6C

Socket

UX4

Heater

2 V

Sections

2

Triode

Air-cooled transmitting triode for Class C RF power amplification and oscillator service, including telegraph and therapy applications.

Base

Not recorded

Socket

Not recorded

Heater

10 V

Sections

1

Triode

Air-cooled transmitting triode for Class C RF power amplification and oscillator service, including telegraph and therapy applications.

Base

Not recorded

Socket

Not recorded

Heater

10 V

Sections

1

Triode-Triode

Directly heated twin triode designed as a Class-B push-pull power amplifier for battery-operated receivers, using two triode units together for economical audio-output service.

Base

Not recorded

Socket

IO

Heater

1.4 V

Sections

2

Triode-Triode

Directly heated twin-triode power amplifier for battery receivers, designed for Class-B push-pull audio output from a low-voltage 1.4 V filament supply.

Base

7AB

Socket

IO

Heater

1.4 V

Sections

2

Triode

Directly heated medium-mu power triode for Class A and push-pull Class B audio-output service in battery-operated equipment.

Base

5S

Socket

IO

Heater

2 V

Sections

1

Triode

GT-envelope directly heated medium-mu power triode for Class A and push-pull Class B audio-output service in battery-operated equipment.

Base

5S

Socket

Not recorded

Heater

2 V

Sections

1

Triode-Triode

Directly heated twin triode intended for Class-B push-pull audio power amplification in battery receivers, with both triode units cooperating as the output stage.

Base

7AB

Socket

IO

Heater

2 V

Sections

2

Triode-Triode

Directly heated twin-triode power amplifier intended for Class-B push-pull battery-receiver service, using a 2.0 V filament and delivering about two watts of audio output.

Base

7AB

Socket

Not recorded

Heater

2 V

Sections

2

Triode

Directly heated power-amplifier triode for the audio output stage of battery-operated receivers.

Base

4D

Socket

UX4

Heater

3.3 V

Sections

1

Triode

Thoriated-tungsten transmitting power triode for Class C oscillator and RF power-amplifier service, with additional transmitting applications. Rated for about 100 W plate dissipation and kilovolt-level plate operation.

Base

Not recorded

Socket

J4

Heater

10 V

Sections

1

Triode

Taylor transmitting power triode closely related to the 203-Z, but with amplification factor about 25 and the plate lead brought through the base. Published ratings cover Class C oscillator and RF power-amplifier service.

Base

Not recorded

Socket

UX4

Heater

10 V

Sections

1

Triode

Directly heated power triode for RF and audio amplification, oscillator, and modulator service. Amperex rates it for substantial transmitting duty, with 100 W plate dissipation and plate voltage up to 1.5 kV.

Base

Not recorded

Socket

Not recorded

Heater

10 V

Sections

1

Triode

High-mu zero-bias Taylor power triode designed especially for Class B audio service. Its high amplification factor permits little or no grid bias, and a pair is specified for roughly 300 W output.

Base

Not recorded

Socket

Not recorded

Heater

10 V

Sections

1

Triode

Directly heated power triode intended for audio-frequency amplifier service. Manufacturer data emphasize power-output operation and the electrical characteristics of a low-mu filamentary triode rather than small-signal receiving use.

Base

Not recorded

Socket

MEDIUM4BAYONET

Heater

4.5 V

Sections

1

Triode

Filamentary power triode developed for power-amplifier applications, with operating information emphasizing output service and substantial plate loading. Its documented role is best understood as a general power triode.

Base

Not recorded

Socket

MEDIUM4BAYONET

Heater

4.5 V

Sections

1

Triode

Power-output triode intended for amplifier service, using a directly heated filament and operating conditions suited to appreciable audio-frequency output. The documentation places it in power rather than small-signal triode service.

Base

Not recorded

Socket

MEDIUM4BAYONET

Heater

4.5 V

Sections

1