Power - Pentode (NOT beam) vacuum tubes

Pentode

Power pentode designed primarily for Class-C radio-frequency transmitting, amplifier, oscillator, or modulated RF service.

Base

Not recorded

Socket

UX4

Heater

5.5 V

Sections

1

Pentode

Power pentode designed primarily for Class-C radio-frequency transmitting, amplifier, oscillator, or modulated RF service.

Base

Not recorded

Socket

UX4

Heater

5 V

Sections

1

Pentode-Triode

Combination triode-pentode with a triode for audio-frequency amplification and a power pentode for output service.

Base

E9-1

Socket

B9A

Heater

32 V

Sections

2

Pentode

Power/output pentode designed for Class-A, single-ended, or push-pull audio-frequency output amplification.

Base

5K

Socket

UX5

Heater

2 V

Sections

1

Pentode

Western Electric high-dissipation general-purpose power pentode with documented loaded operating conditions. Its plate and screen ratings support power-amplifier service beyond ordinary small-signal pentode operation.

Base

Not recorded

Socket

OCTAL6

Heater

10 V

Sections

1

Pentode

Western Electric air-cooled transmitting pentode designed for Class-B RF power service. Its defining role is radio-frequency power amplification in transmitting equipment rather than receiver audio output.

Base

Not recorded

Socket

SMALL5

Heater

6 V

Sections

1

Pentode

Western Electric heater-cathode power pentode with approximately 3.5 W Class-A output at documented operating conditions. Designed for general low-frequency power-amplifier service.

Base

Not recorded

Socket

IO

Heater

6.3 V

Sections

1

Pentode

Power-amplifier pentode using a 6.3 V, 0.3 A heater. Manufacturer handbooks identify it for receiver power-output service rather than small-signal voltage amplification.

Base

5F

Socket

Not recorded

Heater

6.3 V

Sections

1

Pentode

Directly heated power pentode for Class-A audio output with series/parallel filament operation. Its flexible filament arrangement supports battery equipment requiring useful low-frequency output power.

Base

7AQ

Socket

IO

Heater

1.4 V

Sections

1

Pentode

Directly heated power pentode for Class-A audio output with series/parallel filaments. Its low-voltage filamentary construction is suited to portable battery-powered audio equipment.

Base

6BA

Socket

SUBMINIATURE6

Heater

1.4 V

Sections

1

Pentode

Ruggedized version of the 3V4 directly heated power pentode, intended for military equipment and low-voltage audio power amplification. It combines battery operation with strengthened construction.

Base

Not recorded

Socket

B7G

Heater

2.5 V

Sections

1

Pentode

Standard Valves thoriated-tungsten filament RF power pentode. Manufacturer documentation provides transmitting construction, limiting conditions, electrical constants, and operating data for radio-frequency power service.

Base

Not recorded

Socket

MEDIUM5

Heater

7.5 V

Sections

1

Pentode

Standard Valves RF power pentode with published construction, electrical constants, limiting conditions, and Class-C operating data. Designed for transmitting and radio-frequency power-amplifier service.

Base

Not recorded

Socket

GIANT5

Heater

10 V

Sections

1

Pentode

Intermediate-power output pentode designed for audio power-amplifier service. Widely used in receiver output stages, it provides greater load-driving capability than ordinary small-signal pentodes.

Base

6B

Socket

B6

Heater

6.3 V

Sections

1

Pentode

Brimar companion designation to type 41, sharing the same published power-pentode electrical characteristics. Designed for receiver audio-output and low-frequency power-amplifier service.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Pentode

Pentode power amplifier for receiver output stages, electrically related to 6F6/2A5 types apart from heater differences. Designed for conventional audio-frequency power delivery.

Base

6B

Socket

B6

Heater

6.3 V

Sections

1

Pentode

Brimar companion designation to type 42, sharing its published power-pentode characteristics. Intended for receiver audio power-output service rather than small-signal amplification.

Base

Not recorded

Socket

IO

Heater

6.3 V

Sections

1

Pentode

Standard Valves power pentode with documented Class-A, Class-B, and Class-C operating modes extending to approximately 70 MHz. Suitable for both amplifier and radio-frequency power applications.

Base

Not recorded

Socket

MEDIUM5

Heater

5.5 V

Sections

1

Pentode

Standard Valves companion power pentode with documented Class-A, Class-B, and Class-C operation to approximately 70 MHz. Intended for output and RF power-amplifier service.

Base

Not recorded

Socket

MEDIUM5

Heater

5.5 V

Sections

1

Pentode

Brimar companion designation to type 43, sharing its published power-pentode characteristics. Designed for AC/DC receiver audio-output service.

Base

Not recorded

Socket

B8G

Heater

25 V

Sections

1

Pentode

Power-amplifier pentode designed for audio-frequency output service. Philips documentation provides ratings, characteristics, and operating data for low-frequency load-driving applications.

Base

Not recorded

Socket

Not recorded

Heater

Not recorded

Sections

1

Pentode

Series-string power pentode, also designated UL84, for audio-output service in transformerless equipment and low-voltage output stages.

Base

Not recorded

Socket

B9A

Heater

45 V

Sections

1

Pentode

Directly heated Philips audio power pentode delivering approximately 10 W single-ended Class A output.

Base

Not recorded

Socket

Not recorded

Heater

4 V

Sections

1

Pentode

High-transconductance Philips output pentode capable of approximately 9 W single-ended Class A audio power.

Base

Not recorded

Socket

P8A

Heater

6.3 V

Sections

1

Pentode

Octal-base version of the Philips 4654 high-transconductance audio output pentode.

Base

Not recorded

Socket

IO

Heater

6.3 V

Sections

1

Pentode

High-power Philips audio pentode for push-pull Class AB amplification, delivering approximately 28.5 W per pair.

Base

P35-31

Socket

P8A

Heater

4 V

Sections

1

Pentode

Philips high-output audio pentode for push-pull Class AB service, providing approximately 28.5 W per pair.

Base

P35-31

Socket

P8A

Heater

6.3 V

Sections

1

Pentode

High-transconductance audio power pentode providing roughly 8 W single-ended or 29 W push-pull output.

Base

Not recorded

Socket

P8A

Heater

6.3 V

Sections

1

Pentode

Classic directly heated audio power pentode for single-ended and push-pull receiver output stages.

Base

5B

Socket

UX5

Heater

2.5 V

Sections

1

Pentode

Brimar companion version of the classic type 47 directly heated audio power pentode.

Base

Not recorded

Socket

IO

Heater

2.5 V

Sections

1

Pentode

4E27A5125B power - pentode (not beam) electronic tube specifications and datasheets.

Base

Not recorded

Socket

Not recorded

Heater

5 V

Sections

1

Pentode

Heavy-duty power pentode with approximately 18 W plate dissipation for demanding audio and related output-amplifier service.

Base

Not recorded

Socket

B7G

Heater

4 V

Sections

1

Pentode

4P1L power - pentode (not beam) electronic tube specifications and datasheets.

Base

Not recorded

Socket

Not recorded

Heater

4.2 V

Sections

1

Pentode-Triode

Triode/power-pentode combination for compact audio and receiver circuits, with a 7 W pentode output section.

Base

E9-1

Socket

B9A

Heater

50 V

Sections

2

Pentode

Tiny directly heated subminiature battery power pentode for low-power output amplification with minimal filament consumption.

Base

5672

Socket

B5D

Heater

1.25 V

Sections

1

Pentode

Versatile audio power pentode for Class A operation, also usable in triode-connected Class A or Class B service.

Base

7A

Socket

U7B

Heater

2.5 V

Sections

1

Pentode

Output pentode with published operating conditions spanning roughly 50 mW to 1 W for moderate power-amplifier service.

Base

Not recorded

Socket

MEDIUM6

Heater

7.5 V

Sections

1

Pentode

Output pentode identified as an A replacement version, providing conventional power-output service with a 7.5 V heater.

Base

Not recorded

Socket

MEDIUM6

Heater

7.5 V

Sections

1

Pentode

Power/output pentode designed for audio, broadband, telephone, industrial, or general power-amplifier service.

Base

Not recorded

Socket

MEDIUM6

Heater

7.5 V

Sections

1

Pentode

Coaxial repeater pentode designed for amplifier service in communications transmission systems.

Base

Not recorded

Socket

Not recorded

Heater

6.3 V

Sections

1

Pentode

Power pentode designed for radio-frequency transmitting, Class-C power amplification, oscillation, or frequency-multiplier service.

Base

Not recorded

Socket

M7A

Heater

10 V

Sections

1

Pentode

Power pentode designed for radio-frequency transmitting, Class-C power amplification, oscillation, or frequency-multiplier service.

Base

Not recorded

Socket

M7A

Heater

13 V

Sections

1

Pentode

Power pentode designed for radio-frequency transmitting, Class-C power amplification, oscillation, or frequency-multiplier service.

Base

Not recorded

Socket

M7A

Heater

13 V

Sections

1

Pentode

Power pentode designed for radio-frequency transmitting, Class-C power amplification, oscillation, or frequency-multiplier service.

Base

Not recorded

Socket

LARGE5

Heater

10 V

Sections

1

Pentode

Power pentode designed for radio-frequency transmitting, Class-C power amplification, oscillation, or frequency-multiplier service.

Base

Not recorded

Socket

Not recorded

Heater

24 V

Sections

1

Pentode

Power pentode designed for radio-frequency transmitting, Class-C power amplification, oscillation, or frequency-multiplier service.

Base

9K

Socket

B9A

Heater

6 V

Sections

1

Pentode

Power pentode designed for radio-frequency transmitting, Class-C power amplification, oscillation, or frequency-multiplier service.

Base

Not recorded

Socket

Not recorded

Heater

12.6 V

Sections

1

Pentode

Directly heated subminiature power pentode designed for portable, wearable, or low-battery-drain output-amplifier service.

Base

512AX

Socket

Not recorded

Heater

1.25 V

Sections

1