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

—

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

—

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

—

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

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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 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

—

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

—

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

—

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

—

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

—

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

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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

7O

Socket code

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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.

Base

5AB

Socket code

B8G

Electrical Summary

Heater	28 V / 240 mA
Rectifier	S1: 100 mAS2: 100 mA
V Drop	S1: 40 VS2: 40 V
V Inverse	S1: 1,250 VS2: 1,250 V
rP	S1: 15 ΩS2: 15 Ω

Sections

2

8 pins - B8G - Loctal 8-contact

Double-diode full-wave rectifier for AC power supplies. Its 28 V heater construction provides approximately 1.25 kV peak inverse-voltage capability, 100 mA DC output, and 300 mA peak-current capability.

Base

—

Socket code

IO

Electrical Summary

Heater	30 V / 300 mA
Rectifier	S1: 120 mAS2: 120 mA
V Inverse	S1: 500 VS2: 500 V

Sections

2

IO - International Octal

Russian indirectly heated double-anode kenotron for full-wave AC rectification, using two rectifier sections and providing approximately 120 mA DC output.

Base

—

Socket code

IO

Electrical Summary

Heater	30 V / 300 mA
Rectifier	S1: 120 mAS2: 120 mA
V Inverse	S1: 500 VS2: 500 V

Sections

2

IO - International Octal

Russian high-voltage dual-section rectifier for full-wave AC-to-DC conversion. Available documentation confirms two rectifier sections but provides limited verified promoted ratings.

Base

—

Socket code

UX4

Electrical Summary

Heater	5 V / 5 A
V Drop	S1: 10 VS2: 10 V
V Inverse	S1: 300 VS2: 300 V

Sections

2

UX4 - Medium-shell UX 4-contact

Western Electric mercury-vapor full-wave transmitting rectifier using two rectifier paths. Its heavy filament supports substantial peak current with the low voltage drop characteristic of mercury-vapor rectification.

Base

—

Socket code

B4

Electrical Summary

Heater	1.9 V / 3 A
Rectifier	S1: 650 mAS2: 650 mA
V Drop	S1: 7 VS2: 7 V
V Inverse	S1: 90 VS2: 90 V

Sections

2

4 pins - B4 - European 4-pin base

Gas-filled double-anode rectifier designed principally for charging lead-acid batteries. Rated for approximately 650 mA DC output and 4 A peak current, with the low forward drop characteristic of gas-filled rectification.