Electronic tube and vacuum tube catalog

Base

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Socket code

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Electrical Summary

V Drop	S1: 24 VS2: 24 V

Sections

2

Cold-cathode gas-filled full-wave rectifier for DC power supplies, requiring no conventional heater or filament supply. Ionized-gas conduction gives a relatively low forward drop while two rectifier sections provide full-wave operation.

Base

4R

Socket code

IO

Electrical Summary

Ik max	S1: 75 mA
Rectifier	S1: 75 mAS2: 75 mA
V Drop	S1: 24 VS2: 24 V
V Inverse	S1: 1,000 VS2: 1,000 V

Sections

2

4 pins - IO - International Octal

Gas-filled cold-cathode full-wave rectifier for power supplies without a heater or filament supply. Two rectifier sections provide full-wave operation with relatively low gas-discharge forward voltage.

Base

8XD

Socket code

IO

Electrical Summary

Rectifier	S1: 110 mAS2: 110 mA
V Drop	S1: 24 VS2: 24 V
V Inverse	S1: 880 VS2: 880 V

Sections

2

8 pins - IO - International Octal

Gas-filled full-wave rectifier with an ionically heated cathode, intended particularly for vibrator-type power supplies. It requires no separate heater supply and provides substantial current from a compact dual-rectifier structure.

Base

4R

Socket code

IO

Electrical Summary

Ik max	S1: 75 mA
Rectifier	S1: 75 mAS2: 75 mA
V Drop	S1: 24 VS2: 24 V
V Inverse	S1: 1,000 VS2: 1,000 V

Sections

2

4 pins - IO - International Octal

Gas-filled full-wave rectifier with an ionically heated common cathode, requiring no separate heater supply. Its dual rectifier sections provide full-wave power conversion with low gas-discharge forward voltage.

Base

Refer to variations

Socket code

IO

Electrical Summary

Rectifier	S1: 110 mAS2: 110 mA
V Drop	S1: 24 VS2: 24 V
V Inverse	S1: 880 VS2: 880 V

Sections

2

8 pins - IO - International Octal

Gas-filled full-wave rectifier with an ionically heated cathode for vibrator-type power supplies. It operates without a separate heater supply and provides useful current with low gas-discharge forward voltage.

Base

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Socket code

OCTAL5

Electrical Summary

Heater	1 V / 1.2 A
Rectifier	S1: 110 mAS2: 110 mA
V Drop	S1: 24 VS2: 24 V
V Inverse	S1: 1,200 VS2: 1,200 V

Sections

2

5 pins - OCTAL5 - Small-wafer octal 5-contact base

Gas-filled full-wave rectifier for DC power-supply applications. Its two rectifier sections provide substantial current capability and relatively low forward voltage compared with conventional high-vacuum rectifiers.

Base

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Socket code

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Electrical Summary

Heater	117 V / 75 mA
Rectifier	S1: 60 mAS2: 60 mA
V Drop	S1: 15.5 VS2: 15.5 V
V Inverse	S1: 700 VS2: 700 V

Sections

2

Base

1Q

Socket code

IO

Electrical Summary

Heater	117 V / 75 mA
Rectifier	S1: 60 mAS2: 60 mA
V Drop	S1: 15.5 VS2: 15.5 V
V Inverse	S1: 700 VS2: 700 V

Sections

2

8 pins - IO - International Octal

High-vacuum dual rectifier for conventional full-wave and voltage-doubler power supplies. Its 117 V low-current heater makes it particularly useful in transformerless mains-operated equipment.

Base

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Socket code

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Electrical Summary

Heater	12.6 V / 450 mA
Rectifier	S1: 100 mAS2: 100 mA
V Inverse	S1: 1,275 VS2: 1,275 V

Sections

2

7 pins

Miniature cathode-type full-wave rectifier designed for relatively high output-current power supplies. Its two rectifier sections provide substantial inverse-voltage and peak-current capability from a 12.6 V heater.

Base

9B5

Socket code

B9A

Electrical Summary

Heater	12.6 V / 450 mA
Rectifier	S1: 100 mAS2: 100 mA
V Drop	S1: 40 VS2: 40 V
V Inverse	S1: 1,275 VS2: 1,275 V

Sections

2

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

Twin-diode full-wave rectifier with separate cathodes and a center-tapped heater, suitable for capacitor-input and choke-input filter supplies. The separate cathodes provide flexible power-supply circuit arrangements.

Base

5BS

Socket code

B7G

Electrical Summary

Heater	12.6 V / 300 mA
Rectifier	S1: 70 mAS2: 70 mA
V Drop	S1: 22 VS2: 22 V
V Inverse	S1: 1,250 VS2: 1,250 V

Sections

2

7 pins - B7G - Miniature 7-contact

Full-wave vacuum rectifier intended for automobile and AC-operated radio-receiver power supplies. Its 12.6 V heater and useful current capability suit compact receiving-equipment B-plus supplies.

Base

—

Socket code

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Electrical Summary

Heater	12.8 V / 150 mA
Rectifier	S1: 8 mAS2: 8 mA
V Drop	S1: 8 VS2: 8 V
V Inverse	S1: 420 VS2: 420 V

Sections

2

5 pins

12Y4 indirectly heated common-cathode dual-diode full-wave rectifier with British five-pin base, 12.8 V 0.15 A heater and 420 V peak inverse voltage.

Base

—

Socket code

—

Electrical Summary

Heater	12.6 V / 400 mA
Rectifier	S1: 60 mAS2: 60 mA

Sections

2

6 pins

Heater-type high-vacuum full-wave rectifier with a center-tapped heater permitting flexible series or parallel heater operation. Its dual rectifier sections provide moderate-current power-supply service.

Base

5AB

Socket code

LOCTAL8

Electrical Summary

Heater	12.6 V / 300 mA
Rectifier	S1: 70 mAS2: 70 mA
V Drop	S1: 22 VS2: 22 V
V Inverse	S1: 1,250 VS2: 1,250 V

Sections

2

8 pins - LOCTAL8 - Loctal 8-contact base

Indirectly heated high-vacuum full-wave rectifier with high heater-to-cathode voltage capability. Its two rectifier sections provide substantial inverse-voltage and peak-current capability for receiving-equipment power supplies.

Base

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Socket code

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Electrical Summary

Heater	1.9 V / 23 A
Rectifier	S1: 5 AS2: 5 AS3: 5 A
V Drop	S1: 15 VS2: 15 VS3: 15 V
V Inverse	S1: 850 VS2: 850 VS3: 850 V

Sections

3

Directly heated Philips three-anode mercury-vapor/gas industrial rectifier for high-current power conversion. Its multi-anode construction and low arc voltage support multiampere industrial rectification.

Base

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Socket code

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Electrical Summary

Rectifier	S1: 15 AS2: 15 A
V Drop	S1: 15 VS2: 15 V
V Inverse	S1: 850 VS2: 850 V

Sections

2

Philips double-anode mercury-vapor/gas industrial rectifier for high-current power conversion. Its dual-anode construction provides multiampere output with low arc voltage for heavy industrial supplies.

Base

—

Socket code

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Electrical Summary

Heater	1.9 V / 36 A
Rectifier	S1: 25 AS2: 25 AS3: 25 A
V Drop	S1: 15 VS2: 15 VS3: 15 V
V Inverse	S1: 850 VS2: 850 VS3: 850 V

Sections

3

Directly heated Philips three-anode mercury-vapor/gas industrial rectifier for heavy-current power conversion. Its large filament and multi-anode construction provide tens of amperes of rectified current.

Base

—

Socket code

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Electrical Summary

Heater	1.9 V / 36 A
Rectifier	S1: 25 AS2: 25 A
V Drop	S1: 15 VS2: 15 V
V Inverse	S1: 850 VS2: 850 V

Sections

2

Directly heated Philips double-anode mercury-vapor/gas industrial rectifier for heavy-current service. Its large filament and low arc voltage support tens of amperes of rectified output.

Base

—

Socket code

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Electrical Summary

Heater	1.9 V / 70 A
Rectifier	S1: 40 AS2: 40 AS3: 40 A
V Drop	S1: 15 VS2: 15 VS3: 15 V
V Inverse	S1: 850 VS2: 850 VS3: 850 V

Sections

3

Directly heated Philips three-anode mercury-vapor/gas industrial rectifier with auxiliary ignition. Its heavy filament and multi-anode construction provide very high current for industrial power conversion.

Base

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Socket code

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Electrical Summary

Heater	1.9 V / 70 A
Rectifier	S1: 40 AS2: 40 A
V Drop	S1: 15 VS2: 15 V
V Inverse	S1: 850 VS2: 850 V

Sections

2

Directly heated Philips double-anode mercury-vapor/gas industrial rectifier with auxiliary ignition. Heavy-current capability and low arc voltage suit demanding industrial power-conversion systems.

Base

—

Socket code

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Electrical Summary

Heater	4 V / 2 A
Rectifier	S1: 160 mAS2: 160 mA
V Inverse	S1: 1,000 VS2: 1,000 V

Sections

2

Directly heated Philips high-vacuum full-wave rectifier for power supplies. Its dual rectifier sections provide moderate-current high-voltage rectification without the mercury-vapor characteristics of related industrial types.

Base

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Socket code

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Electrical Summary

Heater	1.9 V / 70 A
Rectifier	S1: 60 AS2: 60 A
V Drop	S1: 15 VS2: 15 V
V Inverse	S1: 850 VS2: 850 V

Sections

2

Directly heated Philips double-anode mercury-vapor/gas industrial rectifier with auxiliary ignition. Its heavy filament supports very high average and peak current in industrial power-conversion service.

Base

8E

Socket code

Refer to variations

Electrical Summary

Heater	5 V / 3 A
Rectifier	S1: 250 mAS2: 250 mA
V Drop	S1: 60 VS2: 60 V
V Inverse	S1: 4,500 VS2: 4,500 V

Sections

2

4 pins

Directly heated full-wave high-vacuum rectifier, also designated RK60. Its dual rectifier sections provide unusually high inverse-voltage capability for substantial high-voltage power-supply service.

Base

GOLIATH

Socket code

—

Electrical Summary

Heater	1.9 V / 8 A
Rectifier	S1: 6 AS2: 6 A
V Drop	S1: 10 VS2: 10 V
V Inverse	S1: 300 VS2: 300 V

Sections

2

Philips directly heated double-anode mercury-vapor/gas industrial rectifier designed particularly for battery chargers. Low forward voltage and multiampere output suit efficient high-current charging equipment.

Base

—

Socket code

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Electrical Summary

Heater	1.9 V / 60 A
Rectifier	S1: 50 AS2: 50 A
V Drop	S1: 10 VS2: 10 V
V Inverse	S1: 300 VS2: 300 V

Sections

2

Philips directly heated double-anode mercury-vapor/gas industrial rectifier for very-high-current power conversion. Its heavy filament and low arc voltage support tens of amperes of continuous output.

Base

—

Socket code

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Electrical Summary

Heater	1.9 V / 11 A
Rectifier	S1: 6 AS2: 6 A
V Drop	S1: 15 VS2: 15 V
V Inverse	S1: 880 VS2: 880 V

Sections

2

Philips directly heated double-anode gas-filled industrial rectifier designed particularly for battery-charging equipment. Multiampere output and low forward voltage provide efficient high-current power conversion.

Base

A35

Socket code

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Electrical Summary

Heater	4 V / 500 mA
Rectifier	S1: 30 mAS2: 30 mA

Sections

2

Philips directly heated full-wave high-vacuum rectifier for AC mains receiver power supplies. Its dual-anode structure provides modest B-plus current for lower-power mains-operated radio equipment.

Base

—

Socket code

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Electrical Summary

Heater	4 V / 1 A
Rectifier	S1: 60 mAS2: 60 mA
V Inverse	S1: 1,000 VS2: 1,000 V

Sections

2

Philips directly heated full-wave high-vacuum rectifier for receiver and general power-supply service. Its dual-anode arrangement provides moderate-current full-wave rectification from a conventional four-volt filament.

Base

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Socket code

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Electrical Summary

Heater	4 V / 2.5 A
Plate	S1: 500 V
Rectifier	S1: 180 mA

Sections

2

Philips directly heated full-wave high-vacuum rectifier for receiver power supplies. Its dual-anode construction provides substantially greater rectified current than smaller contemporary mains-receiver rectifiers.

Base

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Socket code

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Electrical Summary

Heater	4 V / 4 A
Rectifier	S1: 300 mAS2: 300 mA

Sections

2

Philips directly heated full-wave high-vacuum rectifier for AC mains receiver power supplies. Its heavy filament and dual-anode construction support comparatively high-current B-plus supplies.

Base

—

Socket code

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Electrical Summary

Heater	4 V / 1 A
Plate	S1: 700 VS2: 700 V
Rectifier	S1: 60 mAS2: 60 mA

Sections

2

Philips directly heated full-wave high-vacuum rectifier for receiver and general power-supply service. Its dual-anode arrangement provides moderate-current full-wave AC rectification from a four-volt filament.

Base

—

Socket code

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Electrical Summary

Heater	1.9 V / 29 A
Rectifier	S1: 12.5 A
V Drop	S1: 10 V
V Inverse	S1: 360 V

Sections

2

Philips directly heated double-anode mercury-vapor/gas full-wave cinema rectifier, providing very high current with the low conducting drop characteristic of gas-discharge rectification.

Base

—

Socket code

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Electrical Summary

Heater	5 V / 1.6 A
Rectifier	S1: 125 mA

Sections

2

Indirectly heated two-plate full-wave rectifier for conventional power-supply service. Heater-cathode isolation and dual rectifier sections provide moderate-current full-wave operation in receiving and general equipment.

Base

—

Socket code

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Electrical Summary

-

Sections

2

Base

—

Socket code

UX4

Electrical Summary

Heater	5 V / 3 A
Rectifier	S1: 250 mAS2: 250 mA
V Inverse	S1: 1,400 VS2: 1,400 V

Sections

2

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

Directly heated full-wave mercury-vapor rectifier for high-voltage power supplies. Its 5 V filament construction provides approximately 1.4 kV peak inverse-voltage capability and 250 mA nominal rectified output, using mercury-vapor conduction for efficient rectification.

Base

—

Socket code

IO

Electrical Summary

Heater	25 V / 300 mA
Plate	S1: 117 V / 2.25 W
Screen	S1: 117 V / 0.8 W
Rectifier	S2: 75 mA
V Inverse	S2: 350 V
rP	S1: 50,000 Ω
gm	S1: 1.8 mA/V

Sections

2

8 pins - IO - International Octal

Combination rectifier diode and power pentode designed to integrate receiver power-supply rectification with audio power-output amplification.

Base

—

Socket code

IO

Electrical Summary

Heater	25 V / 300 mA
Plate	S1: 117 V / 2.25 W
Screen	S1: 117 V / 0.8 W
Rectifier	S2: 75 mA
V Inverse	S2: 350 V
rP	S1: 50,000 Ω
gm	S1: 1.8 mA/V

Sections

2

8 pins - IO - International Octal

GT-envelope combination rectifier and power pentode, interchangeable with 25A7G and intended for receiver power-supply and audio-output service.

Base

7O

Socket code

—

Electrical Summary

Heater	25 V / 150 mA
Rectifier	S1: 60 mAS2: 60 mA
V Drop	S1: 25 VS2: 25 V

Sections

2

7 pins

Dual-section high-vacuum rectifier for series-heater AC/DC receiver power supplies. Its 25 V heater supports voltage-doubler and half-wave configurations with approximately 60 mA nominal output.

Base

6E

Socket code

IO

Electrical Summary

Heater	25 V / 300 mA
Rectifier	S1: 42 mAS2: 42 mA
V Inverse	S1: 700 VS2: 700 V

Sections

2

6 pins - IO - International Octal

Indirectly heated full-wave rectifier and voltage-doubler tube for receiver power supplies. Its 25 V heater construction provides approximately 700 V peak inverse-voltage capability and 42 mA nominal rectified output.

Base

6E

Socket code

UX6

Electrical Summary

Heater	25 V / 300 mA
Rectifier	S1: 75 mAS2: 75 mA
V Drop	S1: 22 VS2: 22 V
V Inverse	S1: 700 VS2: 700 V

Sections

2

6 pins - UX6 - Small 6-contact

Indirectly heated full-wave rectifier and voltage-doubler tube for AC/DC receiver power supplies. Rated for approximately 700 V peak inverse voltage and 75 mA nominal output from a 25 V heater.

Base

7O

Socket code

IO

Electrical Summary

Heater	25 V / 300 mA
Rectifier	S1: 85 mAS2: 85 mA
V Drop	S1: 22 VS2: 22 V
V Inverse	S1: 700 VS2: 700 V

Sections

2

7 pins - IO - International Octal

Indirectly heated full-wave rectifier and voltage-doubler tube for transformerless receiver supplies. Rated for approximately 700 V peak inverse voltage and 85 mA nominal rectified output from a 25 V heater.

Base

—

Socket code

IO

Electrical Summary

Heater	25 V / 300 mA
Rectifier	S1: 85 mAS2: 85 mA

Sections

2

IO - International Octal

Indirectly heated full-wave rectifier and voltage-doubler tube for AC/DC receiver supplies. Its twin rectifier sections support flexible full-wave, half-wave, and voltage-doubler arrangements with substantial receiver-power output.

Base

B7-7

Socket code

IO

Electrical Summary

Heater	25 V / 300 mA
Rectifier	S1: 75 mAS2: 75 mA
V Drop	S1: 22 VS2: 22 V
V Inverse	S1: 700 VS2: 700 V

Sections

2

7 pins - IO - International Octal

Cathode-type full-wave high-vacuum rectifier for transformerless receiver power supplies and voltage-doubler service. Rated for approximately 700 V peak inverse voltage and 75 mA nominal output.

Base

—

Socket code

—

Electrical Summary

Heater	25 V / 300 mA
Rectifier	S1: 75 mAS2: 75 mA
V Drop	S1: 22 VS2: 22 V
V Inverse	S1: 800 VS2: 800 V

Sections

2

8 pins

Twin high-vacuum rectifier with two separate sections for AC/DC receiver power supplies. It supports voltage-doubler, full-wave, or half-wave operation with approximately 800 V peak inverse-voltage capability and 75 mA nominal output.

Base

7Q

Socket code

IO

Electrical Summary

Heater	25 V / 300 mA
Rectifier	S1: 85 mAS2: 85 mA
V Drop	S1: 22 VS2: 22 V
V Inverse	S1: 730 VS2: 730 V

Sections

2

7 pins - IO - International Octal

Ruggedized heater-cathode twin-diode high-vacuum rectifier for receiver power supplies. Its octal construction supports half-wave and voltage-doubler operation with approximately 730 V peak inverse-voltage capability and 85 mA nominal output.

Base

—

Socket code

MEDIUM5

Electrical Summary

Heater	2.5 V / 15 A
V Drop	S1: 8 VS2: 8 V
V Inverse	S1: 100 VS2: 100 V

Sections

2

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

Full-wave argon-filled rectifier using two anodes and a common oxide-coated cathode. Designed for low-voltage DC supplies requiring stable output over a broad temperature range, each rectifier section supports substantial peak current.

Base

—

Socket code

MEDIUM5

Electrical Summary

Heater	2.5 V / 15 A
V Drop	S1: 10 VS2: 10 V

Sections

2

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

Double-anode full-wave mercury-vapor rectifier for higher-current power supplies. Its two rectifier paths each support substantial peak current with the low forward voltage drop characteristic of mercury-vapor conduction.

Base

9BS

Socket code

B9A

Electrical Summary

Heater	26.5 V / 200 mA
Rectifier	S1: 100 mAS2: 100 mA
V Drop	S1: 22 VS2: 22 V
V Inverse	S1: 1,375 VS2: 1,375 V

Sections

2

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

Premium ruggedized double-diode rectifier for airborne and demanding equipment. Rated for approximately 1.375 kV peak inverse voltage and 100 mA DC output, supporting half-wave, full-wave, or voltage-doubler circuits.

Base

UX4

Socket code

MEDIUM4BAYONET

Electrical Summary

Heater	5 V / 2 A
Rectifier	S1: 150 mAS2: 150 mA
V Inverse	S1: 1,650 VS2: 1,650 V

Sections

2

4 pins - MEDIUM4BAYONET - Medium 4-contact bayonet base

Historical Western Electric directly heated full-wave rectifier, electrically equivalent to 274B except for socket arrangement. Its 5 V filament supports approximately 1.65 kV peak inverse voltage and 150 mA DC output.

Base

OCTAL

Socket code

IO

Electrical Summary

Heater	5 V / 2 A
Rectifier	S1: 225 mAS2: 225 mA
V Inverse	S1: 1,500 VS2: 1,500 V

Sections

2

8 pins - IO - International Octal

Western Electric directly heated full-wave rectifier, electrically equivalent to historical 274A except socket arrangement. Rated for approximately 1.5 kV peak inverse voltage, 225 mA DC output, and substantial peak current.