Electronic tube and vacuum tube catalog

Base

9CV

Socket code

B9A

Sections

1

Heater

10.5 V / 450 mA

Plate

300 V / 12 W

Screen

300 V / 2 W

Ik max

65 mA

rP

38,000 Ω

gm

11.3 mA/V

9 pins - B9A - Small-button Noval 9-contact

Miniature audio-output power pentode electrically equivalent to 6BQ5/EL84 except for heater rating. Designed for the output stage of audio-frequency amplifiers, it provides substantial power from compact nine-pin construction.

Base

—

Socket code

B9A

Sections

1

Heater

10 V / 450 mA

Plate

330 V / 13.2 W

Screen

330 V

Ik max

65 mA

rP

38,000 Ω

gm

11.3 mA/V

9 pins - B9A - Small-button Noval 9-contact

Miniature output pentode used in audio amplifier output stages and television video-output stages. Its power-capable construction supports both audio load drive and comparatively high-current wideband video service.

Base

—

Socket code

B9A

Sections

1

Heater

45 V / 100 mA

Plate

250 V / 12 W

Screen

200 V / 1.75 W

Ik max

100 mA

rP

23,000 Ω

gm

10 mA/V

9 pins - B9A - Small-button Noval 9-contact

Output pentode designed for audio power stages in AC/DC mains-powered equipment. Its heater and output characteristics suit transformerless receivers requiring a dedicated low-frequency power amplifier.

Base

—

Socket code

B9A

Sections

1

Heater

12.6 V / 225 mA

Plate

315 V / 12 W

Screen

285 V / 2 W

gm

4.1 mA/V

9 pins - B9A - Small-button Noval 9-contact

Beam-power output tube intended for audio-frequency amplification in television and radio equipment, providing moderate output power from low-voltage receiving-tube supplies.

Base

—

Socket code

B9A

Sections

1

Heater

14.7 V / 300 mA

Plate

350 V / 10 W

Screen

300 V / 2 W

rP

24,000 Ω

gm

20 mA/V

9 pins - B9A - Small-button Noval 9-contact

Power pentode heater variant whose source explicitly references the corresponding 6-volt parent electrical characteristics; intended for power-output service in series-heater equipment.

Base

—

Socket code

IO

Sections

1

Heater

6.3 V / 700 mA

7 pins - IO - International Octal

Pentode intended for amplification or power-output service. Manufacturer documentation supplies electrical ratings, characteristics, operating conditions, capacitances, and construction details supporting general power-capable amplifier operation.

Base

—

Socket code

IO

Sections

1

Heater

6.3 V / 700 mA

Plate

350 V / 10 W

Screen

275 V / 2.5 W

gm

2.5 mA/V

7 pins - IO - International Octal

RCA heater-cathode RF power pentode designed for transmitting service. Its manufacturer ratings are intended for radio-frequency power generation or amplification rather than ordinary receiving or audio-output use.

Base

9GK

Socket code

B9A

Sections

1

Heater

16 V / 300 mA

Plate

330 V / 13.2 W

Screen

330 V / 2 W

Ik max

65 mA

rP

38,000 Ω

gm

11.2 mA/V

9 pins - B9A - Small-button Noval 9-contact

High-transconductance power pentode for audio-output and television video-output stages, with approximately 13.2 W plate dissipation.

Base

—

Socket code

UX6

Sections

1

Heater

14 V / 300 mA

Plate

250 V

Screen

250 V

rP

80,000 Ω

gm

2.5 mA/V

6 pins - UX6 - Small 6-contact

Indirectly heated power pentode similar to types 2A5 and 42, intended for conventional audio-frequency output service with a 14 V heater.

Base

—

Socket code

IO

Sections

1

Heater

1.4 V / 50 mA

Plate

90 V

Screen

90 V

rP

300,000 Ω

gm

0.85 mA/V

μ

255

8 pins - IO - International Octal

Directly heated battery power pentode for very-low-consumption receiver audio output, producing roughly 0.1 W.

Base

6X

Socket code

IO

Sections

1

Heater

1.4 V / 50 mA

Plate

110 V

Screen

110 V

Ik max

6 mA

rP

300,000 Ω

gm

0.85 mA/V

μ

255

8 pins - IO - International Octal

Low-drain directly heated battery power pentode providing approximately 115 mW Class-A audio output from about 90 V.

Base

8CP

Socket code

IO

Sections

1

Heater

1.25 V / 40 mA

Plate

67.5 V

Screen

67.5 V

rP

150,000 Ω

gm

0.75 mA/V

8 pins - IO - International Octal

Ultra-low-power directly heated pentode for battery audio-output service from plate supplies as low as 45–67.5 V.

Base

512AX

Socket code

B7G

Sections

1

Heater

1.25 V / 40 mA

Plate

90 V

Screen

90 V

Ik max

4 mA

rP

180,000 Ω

gm

1 mA/V

7 pins - B7G - Miniature 7-contact

Subminiature directly heated power pentode for compact battery-operated receiver output stages.

Base

G-6X

Socket code

IO

Sections

1

Heater

1.4 V / 100 mA

Plate

110 V

Screen

110 V

Ik max

12 mA

rP

110,000 Ω

gm

1.5 mA/V

7 pins - IO - International Octal

Directly heated battery power pentode for low-voltage, low-current receiver audio-output service.

Base

G-6X

Socket code

IO

Sections

1

Heater

1.4 V / 100 mA

Plate

110 V

Screen

110 V

Ik max

12 mA

rP

110,000 Ω

gm

1.5 mA/V

7 pins - IO - International Octal

Glass tubular directly heated power pentode for low-voltage battery receiver output stages.

Base

6X

Socket code

IO

Sections

1

Heater

2 V / 120 mA

Plate

135 V

Screen

135 V

rP

105,300 Ω

gm

0.95 mA/V

μ

100

7 pins - IO - International Octal

Directly heated battery power pentode capable of roughly 0.45 W Class-A audio output from approximately 135 V.

Base

—

Socket code

IO

Sections

1

Heater

2 V / 240 mA

Plate

180 V

Screen

180 V

7 pins - IO - International Octal

Directly heated power-amplifier pentode for conventional battery-operated receiver output service.

Base

5AD

Socket code

B8G

Sections

1

Heater

1.4 V / 50 mA

Plate

110 V

Screen

110 V

rP

300,000 Ω

gm

0.85 mA/V

8 pins - B8G - Loctal 8-contact

Low-drain directly heated battery power pentode providing roughly 115 mW Class-A audio output.

Base

—

Socket code

B8G

Sections

1

Heater

1.4 V / 50 mA

8 pins - B8G - Loctal 8-contact

Special low-drain battery power pentode for portable receiver output stages where long battery life takes priority over high power.

Base

5AD

Socket code

B8G

Sections

1

Heater

1.4 V / 50 mA

Plate

110 V

Screen

110 V

Ik max

6 mA

rP

250,000 Ω

gm

0.925 mA/V

8 pins - B8G - Loctal 8-contact

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

Base

—

Socket code

B7G

Sections

1

Heater

1.4 V / 100 mA

Plate

90 V

Screen

67.5 V

7 pins - B7G - Miniature 7-contact

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

Base

7AV

Socket code

B7G

Sections

1

Heater

1.4 V / 100 mA

Plate

90 V

Screen

67.5 V

Ik max

11 mA

rP

100,000 Ω

gm

1.575 mA/V

7 pins - B7G - Miniature 7-contact

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

Base

8CP

Socket code

B8D

Sections

1

Heater

1.25 V / 40 mA

Plate

100 V

Screen

100 V

rP

150,000 Ω

gm

0.75 mA/V

8 pins - B8D - Subminiature 8-lead

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

Base

—

Socket code

—

Sections

1

Heater

2 V / 120 mA

rP

200,000 Ω

gm

1.7 mA/V

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

Base

—

Socket code

—

Sections

1

Heater

14 V / 300 mA

rP

50,000 Ω

gm

2.4 mA/V

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

Base

—

Socket code

B5

Sections

1

Heater

2 V / 200 mA

Plate

150 V

Screen

150 V

gm

2.5 mA/V

5 pins - B5 - European 5-pin base

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

Base

7S

Socket code

IO

Sections

1

Heater

25 V / 300 mA

Plate

200 V / 12.5 W

Screen

135 V / 2 W

rP

18,000 Ω

gm

5 mA/V

7 pins - IO - International Octal

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

Base

6B

Socket code

UX6

Sections

1

Heater

2.5 V / 1.75 A

Plate

375 V / 11 W

Screen

285 V / 3.75 W

rP

80,000 Ω

gm

2.6 mA/V

μ

200

6 pins - UX6 - Small 6-contact

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

Base

—

Socket code

UY5

Sections

1

Heater

6.3 V / 1.5 A

Plate

750 V / 30 W

Screen

250 V / 10 W

Ik max

110 mA

5 pins - UY5 - Medium 5-contact

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

Base

—

Socket code

B7G

Sections

1

Heater

1.2 V / 120 mA

Plate

150 V

Screen

135 V / 0.9 W

Ik max

25 mA

7 pins - B7G - Miniature 7-contact

Power pentode designed for both audio/output amplification and radio-frequency power-amplifier service.

Base

—

Socket code

B7G

Sections

1

Heater

1.2 V / 120 mA

Plate

150 V

Screen

135 V / 0.9 W

Ik max

25 mA

7 pins - B7G - Miniature 7-contact

Power pentode designed for both audio/output amplification and radio-frequency power-amplifier service.

Base

—

Socket code

UX4

Sections

1

Heater

2.75 V / 2 A

Plate

300 V / 15 W

Screen

300 V

Ik max

60 mA

gm

4.05 mA/V

4 pins - UX4 - Medium-shell UX 4-contact

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

Base

Refer to variations

Socket code

UX4

Sections

1

Heater

5.5 V / 1 A

Plate

500 V / 15 W

Screen

300 V / 6 W

Ik max

60 mA

gm

4 mA/V

4 pins - UX4 - Medium-shell UX 4-contact

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

Base

—

Socket code

UX4

Sections

1

Heater

5 V / 250 mA

Plate

180 V / 50 W

rP

4,700 Ω

gm

1.8 mA/V

μ

8.5

4 pins - UX4 - Medium-shell UX 4-contact

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

Base

5K

Socket code

UX5

Sections

1

Heater

2 V / 260 mA

Plate

180 V

Screen

180 V

rP

55,000 Ω

gm

1.7 mA/V

μ

90

5 pins - UX5 - Small 5-contact

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

Base

—

Socket code

OCTAL6

Sections

1

Heater

10 V / 640 mA

Plate

250 V / 9.4 W

Screen

250 V / 3.1 W

Ik max

50 mA

rP

80,000 Ω

gm

4.2 mA/V

μ

336

6 pins - OCTAL6 - Octal 6-contact base

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

—

Socket code

SMALL5

Sections

1

Heater

6 V / 1 A

Plate

45 W

gm

4.8 mA/V

μ

96

5 pins - SMALL5 - Small 5-contact transmitting-tube base

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

—

Socket code

IO

Sections

1

Heater

6.3 V / 1 A

Plate

275 V / 9.4 W

Screen

275 V / 3.1 W

Ik max

50 mA

rP

80,000 Ω

gm

4.2 mA/V

μ

336

8 pins - IO - International Octal

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

5F

Socket code

—

Sections

1

Heater

6.3 V / 300 mA

Plate

135 V

Screen

135 V

rP

100,000 Ω

gm

1.2 mA/V

μ

120

5 pins

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

7AQ

Socket code

IO

Sections

1

Heater

1.4 V / 100 mA

Plate

90 V

Screen

90 V

7 pins - IO - International Octal

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

6BA

Socket code

SUBMINIATURE6

Sections

1

Heater

1.4 V / 100 mA

Plate

110 V

Screen

110 V

Ik max

13 mA

gm

1.75 mA/V

6 pins - SUBMINIATURE6 - Subminiature 6-lead base

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

—

Socket code

B7G

Sections

1

Heater

2.5 V / 50 mA

Plate

100 V

Screen

200 V

Ik max

13 mA

rP

100,000 Ω

gm

2.15 mA/V

7 pins - B7G - Miniature 7-contact

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

—

Socket code

MEDIUM5

Sections

1

Heater

7.5 V / 3 A

Plate

1,500 V / 60 W

Screen

300 V / 20 W

rP

500,000 Ω

μ

1,500

5 pins - MEDIUM5 - Medium 5-contact transmitting-tube base

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

—

Socket code

GIANT5

Sections

1

Heater

10 V / 5.4 A

Plate

2,000 V / 100 W

Screen

400 V / 35 W

gm

5 mA/V

5 pins - GIANT5 - Giant 5-contact base

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

6B

Socket code

B6

Sections

1

Heater

6.3 V / 400 mA

Plate

345 V / 9.4 W

Screen

315 V / 3.1 W

Ik max

37.5 mA

rP

75,000 Ω

gm

2.1 mA/V

μ

150

6 pins - B6 - European 6-pin base

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

—

Socket code

—

Sections

1

Heater

6.3 V / 400 mA

rP

68,000 Ω

gm

2.3 mA/V

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

6B

Socket code

B6

Sections

1

Heater

6.3 V / 700 mA

Plate

415 V / 12.1 W

Screen

315 V / 4.13 W

Ik max

50 mA

rP

78,000 Ω

gm

2.85 mA/V

μ

3.5

6 pins - B6 - European 6-pin base

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

—

Socket code

IO

Sections

1

Heater

6.3 V / 700 mA

rP

80,000 Ω

gm

2.5 mA/V

8 pins - IO - International Octal

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

—

Socket code

MEDIUM5

Sections

1

Heater

5.5 V

Plate

500 V / 15 W

Screen

300 V / 6 W

5 pins - MEDIUM5 - Medium 5-contact transmitting-tube base

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

—

Socket code

MEDIUM5

Sections

1

Heater

5.5 V

Plate

500 V / 15 W

Screen

300 V / 6 W

5 pins - MEDIUM5 - Medium 5-contact transmitting-tube base

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.