Electronic tube and vacuum tube catalog

Base

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Socket code

B9A

Electrical Summary

Heater	12.6 V / 300 mA
Plate	450 V / 6.5 W
Ik max	40 mA
gm	7.8 mA/V
μ	20

Sections

1

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

Indirectly heated triode for general electronic service. Available source material confirms triode construction without establishing a narrower functional application confidently.

Base

Refer to variations

Socket code

IO

Electrical Summary

Heater	12.6 V / 250 mA
Plate	500 V / 5 W
μ	5

Sections

1

8 pins - IO - International Octal

Low-mu triode intended for stable RF oscillator service. Published Class C telegraphy operation at 250 V produces about 4 W output, with full-rating operation specified to approximately 30 MHz.

Base

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Socket code

—

Electrical Summary

Heater	4.4 V / 970 mA
Plate	300 V / 3.5 W
Ik max	35 mA
rP	2,300 Ω
gm	1 mA/V
μ	2.3

Sections

1

Directly heated Philips triode designed for telephone equipment and output service, providing low-frequency power amplification in communications circuits.

Base

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Socket code

IO

Electrical Summary

Heater	6.3 V / 900 mA
Plate	500 V / 6.5 W
rP	4,850 Ω
gm	4.85 mA/V
μ	36

Sections

1

8 pins - IO - International Octal

Lighthouse-style power triode for UHF and microwave oscillator and amplifier service. Its compact low-inductance electrode geometry supports operation well into the gigahertz region, with published oscillator performance extending to roughly 3.4 GHz.

Base

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Socket code

B5

Electrical Summary

Heater	4.5 V / 1 A
Plate	200 V / 5 W
rP	5,700 Ω
gm	1 mA/V
μ	5.8

Sections

1

5 pins - B5 - European 5-pin base

Standard Valves triode with published construction, electrical constants, limiting conditions, and operating information; available evidence does not support a narrower functional category.

Base

—

Socket code

MEDIUM4BAYONET

Electrical Summary

Heater	4.5 V / 1 A
Plate	190 V / 5 W
Ik max	60 mA
rP	20,000 Ω
μ	2.3

Sections

1

4 pins - MEDIUM4BAYONET - Medium 4-contact bayonet base

Telephone repeater triode for professional communications amplification.

Base

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Socket code

MEDIUM4BAYONET

Electrical Summary

Heater	4.5 V / 1 A
Plate	190 V / 5 W
Ik max	60 mA
rP	20,000 Ω
μ	2.3

Sections

1

4 pins - MEDIUM4BAYONET - Medium 4-contact bayonet base

Special-limits tested telephone repeater triode for professional communications amplification.

Base

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Socket code

—

Electrical Summary

Heater	6.3 V / 450 mA
Plate	350 V / 7 W
gm	4.7 mA/V

Sections

1

Very-high-transconductance indirectly heated triode for high-gain signal amplification.

Base

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Socket code

MEDIUM4BAYONET

Electrical Summary

Heater	4.5 V / 1 A
Plate	190 V / 5 W
Ik max	60 mA
rP	2,000 Ω
gm	1.15 mA/V
μ	2.3

Sections

1

4 pins - MEDIUM4BAYONET - Medium 4-contact bayonet base

Telephone repeater triode for professional communications amplification.

Base

—

Socket code

MEDIUM4BAYONET

Electrical Summary

Heater	4.5 V / 1 A
Plate	190 V / 5 W
Ik max	60 mA
rP	2,000 Ω
gm	1.15 mA/V
μ	2.3

Sections

1

4 pins - MEDIUM4BAYONET - Medium 4-contact bayonet base

Special-limits tested telephone repeater triode for professional communications amplification.

Base

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Socket code

B5

Electrical Summary

Heater	4 V / 1.1 A
Plate	200 V / 10 W
Ik max	50 mA
rP	2,000 Ω
gm	6.5 mA/V
μ	13

Sections

1

5 pins - B5 - European 5-pin base

3B100B triode for general electronic amplification. Available source material does not establish a narrower functional application confidently.

Base

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Socket code

—

Electrical Summary

Heater	4 V / 1.1 A
Plate	200 V / 10 W
rP	2,000 Ω
gm	6.5 mA/V
μ	13

Sections

1

5 pins

Standard Valves 3B/100-B indirectly heated British five-pin audio power triode with 4 V 1.1 A heater, amplification factor 13 and maximum 10 W anode dissipation.

Base

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Socket code

—

Electrical Summary

Heater	6.3 V / 300 mA
Plate	300 V / 8 W
Ik max	35 mA
gm	22.5 mA/V
μ	70

Sections

1

High-mu ceramic-metal pencil triode for pulsed RF amplification, oscillation, and frequency multiplication into the multi-gigahertz region. High transconductance and compact low-inductance construction provide strong gain in microwave-frequency pulse circuits.

Base

—

Socket code

B4

Electrical Summary

Heater	40 V / 200 mA
Plate	200 V / 8 W
rP	1,330 Ω
gm	7.5 mA/V
μ	10

Sections

1

B4 - European 4-pin base

Cossor triode valve documented with construction, technical data, operating recommendations, and application notes; available evidence does not justify a narrower functional category.

Base

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Socket code

B4

Electrical Summary

Heater	6.3 V / 145 mA
Plate	360 V / 6.25 W
Ik max	25 mA
Rectifier	250 mA
V Inverse	1,000 V
gm	5.5 mA/V
μ	30

Sections

1

4 pins - B4 - European 4-pin base

High-mu ceramic-metal pencil triode for RF power amplification, oscillation, and frequency multiplication. Compact low-inductance construction and modest plate dissipation make it suitable for high-frequency circuits where conventional lead structures are limiting.

Base

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Socket code

—

Electrical Summary

Heater	6.3 V / 300 mA
Plate	400 V / 9.5 W
Ik max	45 mA
gm	7.3 mA/V
μ	40

Sections

1

Medium-mu ceramic-metal pencil triode designed for pulsed and continuous-wave RF oscillator and amplifier service.

Base

—

Socket code

MEDIUM4BAYONET

Electrical Summary

Heater	4.5 V / 1 A
Plate	190 V / 5 W
Ik max	60 mA
rP	2,000 Ω
gm	1.15 mA/V
μ	2.3

Sections

1

4 pins - MEDIUM4BAYONET - Medium 4-contact bayonet base

Directly heated Standard Valves 4104-series triode; variants differ chiefly in filament treatment and grid-to-anode insulation rather than documented application.

Base

—

Socket code

UX4

Electrical Summary

Heater	4.4 V / 970 mA
Plate	160 V / 5 W
rP	2,000 Ω
gm	1.15 mA/V
μ	2.3

Sections

1

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

Directly heated Standard Valves 4104-series triode; variants differ chiefly in filament treatment and grid-to-anode insulation rather than documented application.

Base

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Socket code

UX4

Electrical Summary

Heater	4.4 V / 970 mA
Plate	160 V / 5 W
rP	2,000 Ω
gm	1.15 mA/V
μ	2.3

Sections

1

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

Directly heated Standard Valves 4104-series triode; variants differ chiefly in filament treatment and grid-to-anode insulation rather than documented application.

Base

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Socket code

DISCSEAL4

Electrical Summary

Plate	260 V / 7.5 W
Ik max	33 mA

Sections

1

DISCSEAL4 - Disc-seal planar-triode 4-contact base family

Disc-seal planar triode for microwave amplification or frequency multiplication at frequencies around 4 GHz.

Base

Refer to variations

Socket code

DISCSEAL4

Electrical Summary

Heater	6.3 V / 1.18 A
Plate	270 V / 7.5 W
Ik max	33 mA
gm	50 mA/V
μ	200

Sections

1

DISCSEAL4 - Disc-seal planar-triode 4-contact base family

Low-noise planar microwave triode for amplifier, mixer, and oscillator service from roughly 200 MHz to 4 GHz, with high transconductance and long-life variants.

Base

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Socket code

—

Electrical Summary

Heater	6.3 V / 450 mA
Plate	250 V / 7 W
Ik max	45 mA
rP	900 Ω
gm	46 mA/V
μ	41

Sections

1

9 pins

Directly heated transmitting power triode intended for RF amplifier, oscillator, or modulator service. Manufacturer operating data emphasize radio-frequency power generation, substantial plate loading, and professional transmitter applications.

Base

—

Socket code

—

Electrical Summary

Heater	4.5 V / 1 A
Plate	190 V / 5 W
Ik max	60 mA
rP	2,000 Ω
gm	1.15 mA/V
μ	2.3

Sections

1

Directly heated telephone repeater triode for professional communications amplification.

Base

—

Socket code

B7G

Electrical Summary

Heater	6.3 V / 135 mA
Plate	360 V / 6.25 W
Ik max	25 mA
rP	8,615 Ω
gm	6.5 mA/V
μ	56

Sections

1

7 pins - B7G - Miniature 7-contact

Coaxial pencil-type UHF power triode for RF amplification and oscillation. Its low-inductance construction supports full Class A and Class C ratings to roughly 1.7 GHz and operation at high altitude.

Base

PENCIL

Socket code

B9A

Electrical Summary

Heater	6 V / 280 mA
Plate	330 V / 7 W
Ik max	35 mA
rP	4,500 Ω
gm	6 mA/V
μ	27

Sections

1

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

Medium-mu transmitting triode designed for pulsed oscillator and RF power-amplifier service. Its published ratings emphasize high-frequency pulse operation, combining modest plate dissipation with high-voltage transmitting conditions.

Base

8DM

Socket code

B8D

Electrical Summary

Heater	6.3 V / 450 mA
Plate	165 V / 4 W
gm	1.85 mA/V
μ	4.1

Sections

1

8 pins - B8D - Subminiature 8-lead

Premium subminiature low-mu high-perveance power triode for compact output and driver applications requiring comparatively high current capability.

Base

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Socket code

—

Electrical Summary

Heater	5 V / 78 A
Plate	7 W

Sections

1

Water-cooled transmitting triode for grounded-grid Class B RF amplifier and Class C amplifier/oscillator service in television and FM transmitters.

Base

Refer to variations

Socket code

Refer to variations

Electrical Summary

Heater	6.3 V / 1.18 A
Plate	270 V / 7.5 W
Ik max	33 mA
gm	50 mA/V
μ	200

Sections

1

Western Electric/RMA triode with published operating data. Available source material does not establish a narrower functional application confidently.

Base

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Socket code

—

Electrical Summary

Heater	6.3 V / 575 mA
Plate	300 V / 6.25 W
Ik max	25 mA
gm	23 mA/V
μ	90

Sections

1

Ceramic-metal high-mu planar triode for radio-frequency service to approximately 4 GHz.

Base

6BG

Socket code

B7G

Electrical Summary

Heater	6.3 V / 150 mA
Plate	300 V / 5 W
Ik max	25 mA
rP	7,700 Ω
gm	2.2 mA/V
μ	17

Sections

1

7 pins - B7G - Miniature 7-contact

Power triode intended for radio-frequency amplifier and oscillator service. Manufacturer documentation emphasizes RF power operation and transmitting applications rather than ordinary receiving-tube voltage amplification.

Base

BBA

Socket code

—

Electrical Summary

Heater	6.3 V / 300 mA
Plate	250 V / 5 W
rP	2,250 Ω
gm	7.6 mA/V
μ	17

Sections

1

8 pins

Indirectly heated triode intended for oscillator service.

Base

—

Socket code

—

Electrical Summary

Heater	5.7 V
Plate	1,500 V / 8 W
gm	8.5 mA/V

Sections

1

Soviet high-frequency power triode for specialized RF service. Available manufacturer data show useful transconductance, several watts of plate dissipation, and kilovolt-class plate capability, emphasizing RF power operation rather than conventional audio output.

Base

9FR

Socket code

B9A

Electrical Summary

Heater	6.3 V / 1 A
Plate	330 V / 8 W
Ik max	150 mA
rP	230 Ω
gm	17.5 mA/V
μ	4

Sections

1

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

Very-low-mu power triode specifically designed as a series pass tube in regulated power supplies, with 8-watt plate dissipation.

Base

—

Socket code

—

Electrical Summary

Heater	6.3 V / 300 mA
Plate	10,000 V / 10 W
Ik max	5 mA
gm	0.85 mA/V
μ	550

Sections

1

High-mu triode amplifier for regulated power supplies, voltage amplifiers, television, oscilloscopes, and other high-voltage low-current circuits.

Base

—

Socket code

B9A

Electrical Summary

Heater	12.6 V / 225 mA
Plate	330 V / 6 W
Ik max	4 mA
rP	7,100 Ω
gm	3.5 mA/V

Sections

1

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

High-perveance triode with series/parallel heater capability for general electronic service.

Base

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Socket code

B7G

Electrical Summary

Heater	6.3 V / 225 mA
Plate	330 V / 5 W
Ik max	40 mA
gm	9.5 mA/V
μ	33

Sections

1

B7G - Miniature 7-contact

High-mu miniature power triode designed for continuous Class C RF amplifier service. Its 5 W plate dissipation and useful operation to about 200 MHz make it a compact VHF transmitting or driver tube.

Base

—

Socket code

—

Electrical Summary

Heater	5.7 V / 950 mA
Plate	3,500 V / 10 W
Ik max	4.8 A
gm	25 mA/V
μ	100

Sections

1

High-reliability ceramic-metal planar triode designed for pulsed airborne service at frequencies extending to approximately 3 GHz.

Base

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Socket code

—

Electrical Summary

Heater	5.7 V / 950 mA
Plate	3,500 V / 10 W
Ik max	4.8 A
gm	25 mA/V
μ	100

Sections

1

High-reliability forced-air-cooled ceramic-metal planar triode for pulsed airborne service at frequencies extending to approximately 3 GHz.

Base

—

Socket code

—

Electrical Summary

Heater	5.7 V / 950 mA
Plate	3,500 V / 10 W
Ik max	4.8 A
gm	25 mA/V
μ	100

Sections

1

High-reliability ceramic-metal planar triode designed for transponder and pulsed airborne service at frequencies extending to approximately 3 GHz.

Base

—

Socket code

—

Electrical Summary

Heater	6.3 V
Plate	3,000 V / 6.5 W
Ik max	3 A
rP	2,300 Ω
gm	25 mA/V

Sections

1

High-mu ceramic-metal planar triode designed for plate-pulsed oscillator or amplifier operation at frequencies extending to approximately 6 GHz.

Base

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Socket code

—

Electrical Summary

Heater	6.3 V / 400 mA
Plate	330 V / 5.5 W
Ik max	30 mA
rP	2,500 Ω
gm	40 mA/V
μ	100

Sections

1

High-mu ceramic-metal planar triode designed primarily for oscillator or radio-frequency power-amplifier service.

Base

—

Socket code

B9A

Electrical Summary

Heater	12.6 V / 230 mA
Plate	300 V / 10 W
gm	29 mA/V
μ	28

Sections

1

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

General-purpose triode for amplification or electronic service as documented by the manufacturer.

Base

—

Socket code

B9A

Electrical Summary

Heater	12.6 V / 190 mA
Plate	300 V / 5 W
gm	23 mA/V
μ	31

Sections

1

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

General-purpose triode for amplification or electronic service as documented by the manufacturer.

Base

—

Socket code

—

Electrical Summary

Heater	6.3 V / 400 mA
Plate	300 V / 5 W
Ik max	40 mA
gm	29 mA/V
μ	110

Sections

1

Metal-ceramic planar UHF triode for radio-frequency power-amplifier service. Its high transconductance and amplification factor around 110 combine strong gain with extremely low plate-to-cathode capacitance in compact high-frequency circuitry.

Base

Refer to variations

Socket code

Refer to variations

Electrical Summary

Heater	6.3 V / 650 mA
Plate	7 W

Sections

1

Special-quality UHF power triode for grounded-grid amplifiers and oscillators at frequencies to approximately 1 GHz, co-designated with EC8010.

Base

—

Socket code

B9A

Electrical Summary

Heater	6.3 V / 225 mA
Plate	250 V / 2.5 W
Ik max	25 mA
rP	4,375 Ω
gm	16 mA/V
μ	70

Sections

1

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

Fast-warm-up ceramic-metal high-mu triode for linear RF amplification, oscillator, doubler, and tripler service.

Base

—

Socket code

—

Electrical Summary

Heater	6 V / 1 A
Plate	4,500 V / 10 W
Ik max	7.5 A
gm	38 mA/V
μ	80

Sections

1

Rugged planar triode for CW or pulsed oscillator, multiplier, modulator, amplifier, and regulator service at frequencies to approximately 3 GHz.

Base

—

Socket code

—

Electrical Summary

Heater	5.7 V / 950 mA
Plate	3,500 V / 10 W
Ik max	5 A
gm	30 mA/V
μ	80

Sections

1

Ruggedized high-mu ceramic-metal planar triode for grid-pulsed, plate-pulsed, or CW oscillator, amplifier, multiplier, modulator, and regulator service to approximately 3 GHz.

Base

5BD

Socket code

ACORN5

Electrical Summary

Heater	1.25 V / 100 mA
Plate	135 V / 0.6 W
Ik max	7 mA
rP	10,000 Ω
gm	1.2 mA/V
μ	12

Sections

1

5 pins - ACORN5 - Acorn 5-pin

Directly heated acorn transmitting triode for RF power amplification and oscillator service through approximately 350 MHz.

Base

—

Socket code

—

Electrical Summary

Heater	2.25 V / 1.75 A
rP	4,300 Ω
gm	1.4 mA/V
μ	6

Sections

1