Electronic tube and vacuum tube catalog

Base

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Socket code

B8G

Electrical Summary

Heater	10 V / 93 mA
Plate	250 V / 2 W
Screen	225 V / 0.7 W

Sections

1

B8G - Loctal 8-contact

Russian pentode documented in bilingual manufacturer literature. The available source establishes its pentode construction and published guaranteed characteristics, but provides insufficient explicit application wording to assign a more specialized functional category conservatively.

Base

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Socket code

B8G

Electrical Summary

Heater	10 V / 97 mA
Plate	250 V
gm	1.7 mA/V

Sections

1

B8G - Loctal 8-contact

Russian pentode documented in bilingual manufacturer literature with guaranteed electrical characteristics. The available source establishes signal-tube operation but does not provide enough explicit functional wording to support a narrower classification without inference.

Base

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Socket code

B8G

Electrical Summary

Heater	12.6 V / 74 mA
Plate	250 V / 2 W
Screen	225 V / 0.7 W
gm	1.7 mA/V

Sections

1

8 pins - B8G - Loctal 8-contact

Russian pentode documented in bilingual manufacturer literature with guaranteed electrical characteristics. The surviving source information establishes pentode operation but does not clearly identify a specialized application or cutoff class.

Base

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Socket code

B8G

Electrical Summary

Heater	12.6 V / 74 mA
Plate	250 V / 2 W
Screen	225 V / 0.7 W
Ik max	11 mA
gm	1.71 mA/V

Sections

1

8 pins - B8G - Loctal 8-contact

Russian pentode designed for reliable operation under ambient influences, with a manufacturer service-life guarantee of 3,000 hours. Published data describe a signal-amplifier pentode with conventional voltage-amplification operating characteristics.

Base

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Socket code

M7A

Electrical Summary

Heater	4 V / 1.3 A
Plate	220 V / 1.8 W
Screen	220 V / 0.4 W
Ik max	12 mA
gm	5 mA/V

Sections

1

7 pins - M7A - British/European 7-pin

Philips professional pentode designed for long-life telephone-equipment service. Its intended role is reliable small-signal amplification in communications installations where extended operating life is more important than consumer-receiver convenience.

Base

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Socket code

M7A

Electrical Summary

Heater	21 V / 285 mA
Plate	150 V / 1.2 W
Screen	150 V / 0.4 W
Ik max	13 mA
gm	8.3 mA/V

Sections

1

7 pins - M7A - British/European 7-pin

Philips professional pentode designed for long-life telephone-equipment service. Manufacturer documentation places it in reliable communications signal amplification, emphasizing extended service life for continuously operated telephone installations.

Base

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Socket code

B9A

Electrical Summary

Heater	18 V / 100 mA
Plate	210 V / 2.1 W
Screen	210 V / 0.35 W
Ik max	16 mA
gm	9 mA/V
μ	34

Sections

1

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

Philips professional pentode designed for long-life telephone-equipment service. Its manufacturer documentation emphasizes dependable small-signal operation in communications installations requiring extended service life and professional reliability.

Base

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Socket code

B8G

Electrical Summary

Heater	20 V / 125 mA
Plate	300 V
Screen	300 V
gm	6.5 mA/V

Sections

1

8 pins - B8G - Loctal 8-contact

Philips professional signal pentode with published heater, capacitance, characteristic, operating-condition, and limiting-value data. The available source supports general professional signal amplification but does not clearly establish a narrower functional category.

Base

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Socket code

B8G

Electrical Summary

Heater	20 V / 125 mA
Plate	300 V / 4 W
Screen	300 V / 1 W
Ik max	30 mA
gm	6.5 mA/V

Sections

1

8 pins - B8G - Loctal 8-contact

Special-quality Philips C3m pentode for AF, IF, RF, oscillator, and output service. Manufacturer documentation specifies a 10,000-hour life test, making extended professional service life a defining feature of this versatile signal and low-power output tube.

Base

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Socket code

—

Electrical Summary

Heater	2 V / 60 mA
Plate	180 V
Ik max	3.1 mA
rP	1,000,000 Ω
gm	0.75 mA/V
μ	750

Sections

1

Directly heated pentode for radio-frequency and intermediate-frequency amplification in battery receivers. RCA designed it as a low-power signal tube for portable battery-operated radio equipment rather than an output-stage device.

Base

—

Socket code

—

Electrical Summary

Heater	1.2 V / 13 mA
Plate	120 V / 0.12 W
Screen	90 V
Ik max	1.6 mA

Sections

1

Economical directly heated subminiature Russian pentode for high- and intermediate-frequency amplification. Its compact filamentary construction targets miniature RF/IF signal equipment where low power consumption and small size are desirable.

Base

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Socket code

UX4

Electrical Summary

Heater	2 V / 120 mA
Plate	180 V

Sections

1

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

Directly heated receiving pentode intended for general amplifier service in low-voltage battery equipment.

Base

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Socket code

—

Electrical Summary

Heater	2 V / 120 mA
Plate	180 V / 0.5 W
Screen	135 V / 0.13 W
rP	1,000,000 Ω
gm	1.05 mA/V

Sections

1

7 pins

Directly heated Radiotron pentode for battery-powered Class A voltage amplification, using a 2 V, 120 mA coated filament. Can operate with screen and plate interconnected without creating an additional physical triode.

Base

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Socket code

—

Electrical Summary

Heater	1.25 V / 11 mA
gm	0.4 mA/V

Sections

1

Russian miniature directly heated low-power pentode for mobile electronics, using a 1.25 V, 11 mA oxide-coated filament and flexible leads.

Base

5BZ

Socket code

B7G

Electrical Summary

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

Sections

1

7 pins - B7G - Miniature 7-contact

Directly heated power-amplifier pentode designed for battery-operated receiver output service with published Class-A operating conditions.

Base

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Socket code

—

Electrical Summary

Heater	1.2 V / 59 mA
gm	0.95 mA/V

Sections

1

Directly heated pentode for oscillation, amplification and mixing.

Base

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Socket code

—

Electrical Summary

Heater	1.2 V / 15 mA
gm	0.36 mA/V

Sections

1

Low-consumption directly heated pentode for mixing and amplification.

Base

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Socket code

—

Electrical Summary

Heater	11 V / 200 mA
Plate	250 V / 4 W
Screen	250 V / 1 W
rP	125,000 Ω
gm	10.6 mA/V
μ	33

Sections

1

Series-heater screened pentode designed for television receiver amplification service.

Base

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Socket code

B7

Electrical Summary

Heater	2 V / 100 mA
Plate	150 V
Screen	80 V
gm	1.3 mA/V

Sections

1

7 pins - B7 - Medium 7-contact

Cossor receiving pentode intended for receiver and amplifier service; available source does not clearly support a narrower functional category.

Base

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Socket code

B7

Electrical Summary

Heater	2 V / 100 mA
Plate	150 V
Screen	80 V
gm	1 mA/V

Sections

1

7 pins - B7 - Medium 7-contact

Cossor receiving pentode intended for receiver and amplifier service; available source does not clearly support a narrower functional category.

Base

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Socket code

B5

Electrical Summary

Heater	2 V / 200 mA
Plate	150 V
Screen	150 V
gm	2.5 mA/V

Sections

1

5 pins - B5 - European 5-pin base

Cossor receiving pentode intended for receiver and amplifier service; available source does not clearly support a narrower functional category.

Base

—

Socket code

—

Electrical Summary

Heater	2 V / 60 mA
Plate	180 V
Screen	67.5 V
gm	0.65 mA/V

Sections

1

Receiving pentode amplifier documented in Cunningham/RCA literature; available source does not clearly establish a narrower dominant function.

Base

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Socket code

MEDIUM5

Electrical Summary

Heater	2 V / 1.6 A
Plate	250 V
Screen	200 V / 1 W
Ik max	12.5 mA
rP	137,000 Ω
gm	1.02 mA/V
μ	140

Sections

1

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

Western Electric heater-cathode general-purpose suppressor-grid pentode intended for general electronic amplification.

Base

E9-1

Socket code

B9A

Electrical Summary

Heater	2.5 V / 600 mA
Plate	300 V / 1 W
Screen	200 V / 0.2 W
Ik max	4 mA
rP	2,500,000 Ω
gm	2 mA/V
μ	38

Sections

1

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

Pentode designed specifically for transitron circuits in television receivers, with ratings and capacitances tailored to that oscillator/control technique.

Base

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Socket code

—

Electrical Summary

Heater	2.4 V
Plate	0.6 W
gm	2.4 mA/V

Sections

1

Russian pentode documented in technical reference literature; available source does not clearly establish a narrower specialized application.

Base

—

Socket code

B9A

Electrical Summary

Heater	2.2 V / 120 mA
Plate	200 V / 1 W
Screen	120 V / 0.3 W
Ik max	5 mA
gm	1.7 mA/V

Sections

1

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

Directly heated Russian low-power pentode designed for RF power amplification and oscillator service to approximately 120 MHz.

Base

B9A

Socket code

B9A

Electrical Summary

Heater	7.3 V / 300 mA
Plate	250 V / 3 W
Screen	250 V / 1 W
gm	8.8 mA/V
μ	55

Sections

1

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

High-slope screened HF pentode designed as a straight television amplifier in AC/DC series-heater receivers.

Base

7K

Socket code

OCTAL7

Electrical Summary

Heater	10 V / 320 mA
Plate	250 V / 2.5 W
Screen	180 V / 0.4 W
Ik max	10 mA
rP	750,000 Ω
gm	1.8 mA/V

Sections

1

7 pins - OCTAL7 - 7-contact octal-family base

Western Electric heater-cathode general-purpose pentode designed for voltage amplification.

Base

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Socket code

OCTAL6

Electrical Summary

Heater	10 V / 320 mA
Plate	250 V / 2.5 W
Screen	180 V / 0.4 W
Ik max	10 mA
rP	1,400,000 Ω
gm	1.84 mA/V

Sections

1

6 pins - OCTAL6 - Octal 6-contact base

Western Electric heater-cathode general-purpose pentode designed for voltage amplification.

Base

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Socket code

OCTAL6

Electrical Summary

Heater	7.5 V / 425 mA
Plate	250 V / 2.5 W
Screen	180 V / 0.4 W
Ik max	10 mA
rP	750,000 Ω
gm	1.8 mA/V

Sections

1

6 pins - OCTAL6 - Octal 6-contact base

Western Electric heater-cathode suppressor-grid pentode designed for general-purpose voltage amplification.

Base

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Socket code

OCTAL6

Electrical Summary

Heater	10 V / 320 mA
Plate	250 V / 2 W
Screen	180 V / 0.4 W
Ik max	10 mA
rP	850,000 Ω
gm	1.74 mA/V

Sections

1

6 pins - OCTAL6 - Octal 6-contact base

Western Electric heater-cathode suppressor-grid pentode intended for general-purpose electronic amplification.

Base

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Socket code

OCTAL7

Electrical Summary

Heater	6.3 V / 500 mA
Plate	250 V / 2.5 W
Screen	180 V / 0.4 W
Ik max	10 mA
rP	1,400,000 Ω
gm	1.84 mA/V

Sections

1

7 pins - OCTAL7 - 7-contact octal-family base

Western Electric heater-cathode general-purpose pentode with a 275-volt maximum plate rating.

Base

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Socket code

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Electrical Summary

Heater	2 V / 250 mA
Plate	250 V / 2 W
Screen	150 V / 0.45 W
rP	1,500,000 Ω
gm	1.28 mA/V

Sections

1

7 pins

Western Electric oxide-filament general-purpose pentode intended for electronic amplification.

Base

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Socket code

UX4

Electrical Summary

Heater	6.3 V / 150 mA
Plate	250 V / 1.85 W
Screen	120 V / 0.55 W
Ik max	12 mA
rP	500,000 Ω
gm	2.5 mA/V

Sections

1

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

Miniature Western Electric pentode with published Class-A characteristics, intended for low-level amplifier service.

Base

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Socket code

IO

Electrical Summary

Heater	6.3 V / 150 mA
Plate	250 V / 1.85 W
Screen	120 V / 0.55 W
Ik max	12 mA
rP	500,000 Ω
gm	2.5 mA/V

Sections

1

6 pins - IO - International Octal

Octal-base Western Electric pentode with published Class-A characteristics, intended for low-level amplifier service.

Base

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Socket code

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Electrical Summary

Heater	6.3 V / 150 mA
Plate	180 V / 1.85 W
Screen	120 V / 0.55 W
rP	390,000 Ω
gm	4 mA/V

Sections

1

Miniature high-transconductance Western Electric pentode intended for voltage-amplifier service.

Base

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Socket code

—

Electrical Summary

Heater	3.15 V / 440 mA

Sections

1

Rugged indirectly heated miniature pentode.

Base

—

Socket code

—

Electrical Summary

Heater	3.15 V / 440 mA

Sections

1

Rugged indirectly heated miniature pentode.

Base

E7-1

Socket code

B7G

Electrical Summary

Heater	6.3 V / 150 mA
Plate	200 V / 1.85 W
Screen	155 V / 0.55 W
Ik max	20 mA
rP	300,000 Ω
gm	5 mA/V

Sections

1

7 pins - B7G - Miniature 7-contact

Long-life high-transconductance miniature pentode for professional RF and broadband amplification, developed as a durable communications-service replacement.

Base

E9-1

Socket code

B9A

Electrical Summary

Heater	6.3 V / 300 mA
Plate	180 V / 3 W
Screen	150 V / 0.75 W
Ik max	35 mA
rP	100,000 Ω
gm	12.5 mA/V

Sections

1

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

Low-noise frame-grid pentode developed for UHF and broadband professional amplification, combining very high transconductance with low capacitances.

Base

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Socket code

B8D

Electrical Summary

Heater	0.5 V / 8 mA
Plate	45 V
Screen	45 V

Sections

1

8 pins - B8D - Subminiature 8-lead

Directly heated subminiature electrometer pentode designed specifically for pH meters and other extremely high-impedance measurement circuits.

Base

E7-1

Socket code

B7G

Electrical Summary

Heater	6.3 V / 175 mA
Plate	180 V / 1.7 W
Screen	140 V / 0.75 W
Ik max	18 mA
gm	1.85 mA/V

Sections

1

7 pins - B7G - Miniature 7-contact

Miniature triple-grid pentode for low-power HF/UHF applications, with independently controllable suppressor grid supporting gating, mixing, and modulation.

Base

—

Socket code

UX6

Electrical Summary

Heater	10 V / 320 mA
Plate	250 V
Screen	180 V
Ik max	10 mA
gm	2 mA/V

Sections

1

6 pins - UX6 - Small 6-contact

Professional carrier-frequency pentode designed for telecommunications amplifier service rather than ordinary consumer-radio applications.

Base

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Socket code

UX6

Electrical Summary

Heater	10 V / 320 mA
Plate	250 V
Screen	180 V

Sections

1

6 pins - UX6 - Small 6-contact

Carrier-frequency pentode intended for professional telecommunications amplification with operating characteristics optimized for dependable communications service.

Base

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Socket code

UX6

Electrical Summary

Heater	7.5 V / 425 mA
Plate	250 V
Screen	180 V
Ik max	7.5 mA
gm	2 mA/V

Sections

1

6 pins - UX6 - Small 6-contact

Professional 4328-family carrier-frequency pentode designed for dependable telecommunications amplifier service.

Base

E7-1

Socket code

B7G

Electrical Summary

Heater	6.3 V / 150 mA
Plate	180 V / 1.7 W
Screen	140 V / 0.5 W
Ik max	18 mA
rP	450,000 Ω
gm	2 mA/V

Sections

1

7 pins - B7G - Miniature 7-contact

Long-life RF pentode designed for amplifier service from low through very high frequencies, including operation from comparatively low supply voltages.

Base

8DL

Socket code

SUBMINIATURE8

Electrical Summary

Heater	6.3 V / 450 mA
Plate	165 V / 4 W
Screen	155 V / 1 W
Ik max	40 mA
rP	50,000 Ω
gm	9 mA/V

Sections

1

8 pins - SUBMINIATURE8 - Subminiature 8-lead base

Rugged premium subminiature pentode developed for broadband radar and video amplification in military, airborne, and industrial equipment.

Base

6F

Socket code

UX6

Electrical Summary

Heater	2.5 V / 1 A
Plate	250 V
Screen	100 V
rP	1,700,000 Ω
gm	1.51 mA/V
μ	2,500

Sections

1

6 pins - UX6 - Small 6-contact

Early triple-grid pentode designed for radio detector and high-gain voltage-amplifier service, with both pentode and triode-connected operating data.

Base

5702

Socket code

SUBMINIATURE8

Electrical Summary

Heater	6.3 V / 200 mA
Plate	180 V
Screen	140 V
gm	3.2 mA/V

Sections

1

8 pins - SUBMINIATURE8 - Subminiature 8-lead base

Subminiature dual-control RF pentode whose transconductance can be varied through the third grid. Manufacturer Class A data document operation at different grid-3 biases, making it useful where electronic gain or signal control is required.

Base

E9-1

Socket code

B9A

Electrical Summary

Heater	6.3 V / 300 mA
Plate	180 V / 3 W
Screen	150 V / 0.75 W
Ik max	35 mA
rP	100,000 Ω
gm	12.5 mA/V

Sections

1

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

High-gain miniature broad-band pentode intended for wideband amplification. Amperex and other manufacturer sources document broad-band operating conditions, high gain, and shielding considerations for signal circuits requiring substantial bandwidth.