Electronic tube and vacuum tube catalog

Base

4BU

Socket code

IO

Electrical Summary

Rectifier	75 mA
V Inverse	300 V

Sections

1

4 pins - IO - International Octal

Gas-filled half-wave rectifier with a starter anode for power supplies. It requires no conventional heater supply and is rated for approximately 300 V peak inverse voltage, 75 mA DC output, and 500 mA peak current.

Base

4BU

Socket code

IO

Electrical Summary

Rectifier	75 mA
V Inverse	300 V

Sections

1

4 pins - IO - International Octal

Gas-filled half-wave rectifier with a starter anode for electronic power supplies. It requires no conventional heater supply and is rated for approximately 300 V peak inverse voltage, 75 mA DC output, and 500 mA peak current.

Base

—

Socket code

—

Electrical Summary

Heater	1.9 V / 2.8 A
Rectifier	100 mA
V Inverse	500 V

Sections

1

Directly heated Philips gas-filled industrial rectifier designed particularly for battery-charger service. Rated for approximately 500 V peak inverse voltage and 100 mA average output from an oxide-coated filament.

Base

—

Socket code

J4

Electrical Summary

Heater	5 V / 6.5 A
Plate	60 W
Rectifier	100 mA
V Inverse	40,000 V

Sections

1

J4 - Jumbo 4-contact

Eimac high-vacuum half-wave rectifier for high-voltage power supplies. Rated for approximately 40 kV peak inverse voltage and 100 mA average plate current for industrial and transmitting applications.

Base

—

Socket code

—

Electrical Summary

Heater	1.9 V / 3.5 A
Rectifier	650 mA
V Drop	9 V
V Inverse	185 V

Sections

1

Directly heated Philips gas-filled industrial rectifier for charging lead-acid batteries. Rated for approximately 185 V peak inverse voltage, 650 mA average current, and 4 A peak current.

Base

—

Socket code

—

Electrical Summary

Heater	1.8 V / 1.8 A
Rectifier	200 mA
V Drop	15 V

Sections

1

Directly heated Philips gas-filled rectifier intended for charging applications. It provides approximately 200 mA average output capability with a characteristic valve voltage drop around 15 V.

Base

—

Socket code

—

Electrical Summary

Heater	20 V / 19 A
Plate	750 W
V Drop	400 V
V Inverse	75,000 V

Sections

1

Machlett high-vacuum industrial rectifier for high-power applications such as electrostatic precipitation. Rated for approximately 75 kV peak inverse voltage and 750 mA peak anode current from a rugged tungsten filament.

Base

—

Socket code

—

Electrical Summary

Heater	10 V / 11.5 A
V Inverse	125,000 V

Sections

1

Machlett high-vacuum industrial rectifier for converting relatively small AC currents at extremely high voltage to DC. Rated for approximately 125 kV peak inverse voltage for demanding industrial power supplies.

Base

—

Socket code

—

Electrical Summary

Heater	1.9 V / 11 A
Rectifier	3 A
V Drop	9 V
V Inverse	185 V

Sections

1

Directly heated Philips mercury-vapour or gas-filled industrial rectifier for battery charging. Rated for approximately 185 V peak inverse voltage, 3 A average current, and 18 A peak current.

Base

—

Socket code

—

Electrical Summary

Heater	1.9 V / 20 A
Rectifier	7.5 A
V Drop	9 V
V Inverse	185 V

Sections

1

Directly heated Philips mercury-vapour or gas-filled industrial rectifier for high-current battery charging. Rated for approximately 185 V peak inverse voltage, 7.5 A average current, and 45 A peak current.

Base

—

Socket code

—

Electrical Summary

Heater	1.9 V / 7 A
Rectifier	3 A
V Inverse	185 V

Sections

1

Directly heated Philips gas-filled industrial rectifier for battery-charger service. Rated for approximately 185 V peak inverse voltage, 3 A average output, and 18 A peak current from an oxide-coated filament.

Base

—

Socket code

—

Electrical Summary

Heater	1.9 V / 25.5 A
Rectifier	12.5 A
V Drop	9 V
V Inverse	185 V

Sections

1

Directly heated Philips mercury-vapour or gas-filled industrial rectifier for high-current battery charging. Rated for approximately 185 V peak inverse voltage, 12.5 A average current, and 75 A peak current.

Base

—

Socket code

—

Electrical Summary

Heater	1.9 V / 44 A
Rectifier	12.5 A
V Inverse	150 V

Sections

1

Directly heated Philips mercury-vapour or gas-filled industrial rectifier designed specifically for welding power supplies. Rated for approximately 150 V peak inverse voltage, 12.5 A average current, and 75 A peak current.

Base

—

Socket code

—

Electrical Summary

Heater	1.9 V / 68 A
Rectifier	20 A
V Drop	9 V
V Inverse	150 V

Sections

1

Directly heated Philips mercury-vapour or gas-filled industrial rectifier for welding power supplies. Rated for approximately 150 V peak inverse voltage, 20 A average current, and 120 A peak current.

Base

—

Socket code

—

Electrical Summary

Heater	1.9 V / 40 A
Rectifier	20 A
V Inverse	185 V

Sections

1

Directly heated Philips mercury-vapour or gas-filled industrial rectifier for heavy-duty battery charging. Rated for approximately 185 V peak inverse voltage, 20 A average current, and 120 A peak current.

Base

—

Socket code

—

Electrical Summary

Heater	1.9 V / 7 A
Rectifier	2 A
V Inverse	700 V

Sections

1

Directly heated Philips mercury-vapour or gas-filled rectifier for industrial power conversion. Rated for approximately 700 V peak inverse voltage, 2 A average current, and 12 A peak current.

Base

—

Socket code

—

Electrical Summary

Heater	3.25 V / 70 A
Rectifier	30 A
V Drop	10 V
V Inverse	170 V

Sections

1

Directly heated Philips mercury-vapour or gas-filled industrial rectifier for heavy-duty welding service. Rated for approximately 170 V peak inverse voltage, 30 A average current, and 200 A peak current.

Base

—

Socket code

—

Electrical Summary

Heater	13 V / 12.5 A
V Inverse	140,000 V

Sections

1

Machlett high-vacuum industrial rectifier for extremely high-voltage power supplies. Rated for approximately 140 kV peak inverse voltage and 200 mA peak anode current, emphasizing exceptional inverse-voltage capability.

Base

—

Socket code

—

Electrical Summary

Heater	1.9 V / 11 A
Rectifier	5 A
V Inverse	185 V

Sections

1

Directly heated Philips mercury-vapour or gas-filled industrial rectifier for battery-charger service. Rated for approximately 185 V peak inverse voltage, 5 A average output, and 30 A peak current.

Base

—

Socket code

—

Electrical Summary

Heater	1.9 V / 3.5 A
Rectifier	850 mA
V Drop	9 V
V Inverse	185 V

Sections

1

Directly heated Philips gas-filled industrial rectifier for charging lead-acid batteries. Rated for approximately 185 V peak inverse voltage, 850 mA average current, and 5 A peak current.

Base

—

Socket code

—

Electrical Summary

Heater	1.9 V / 5.5 A
Rectifier	1.5 A
V Drop	9 V
V Inverse	140 V

Sections

1

Directly heated Philips gas-filled industrial rectifier for charging batteries of up to about twelve lead-acid cells. Rated for approximately 140 V peak inverse voltage and 1.5 A nominal output.

Base

—

Socket code

—

Electrical Summary

Heater	1.9 V / 5.5 A
Rectifier	1.5 A
V Inverse	185 V

Sections

1

Directly heated Philips gas-filled industrial rectifier with oxide-coated filament for battery-charger service. Rated for approximately 185 V peak inverse voltage and 1.5 A nominal rectified output.

Base

GOLIATH

Socket code

—

Electrical Summary

Heater	2.5 V / 27 A
Rectifier	15 A
V Drop	10 V
V Inverse	275 V

Sections

1

Directly heated Philips mercury-vapour or gas-filled industrial rectifier for battery charging and cinema rectifier equipment. Rated for approximately 275 V peak inverse voltage and 15 A nominal output.

Base

—

Socket code

—

Electrical Summary

Heater	10 V / 11.5 A
V Inverse	125,000 V

Sections

1

Machlett directly heated high-vacuum industrial rectifier for very-high-voltage power supplies. Rated for approximately 125 kV peak inverse voltage for demanding industrial rectification and high-voltage electronic equipment.

Base

GOLIATH

Socket code

—

Electrical Summary

Heater	2.25 V / 17 A
Rectifier	6 A
V Drop	9 V
V Inverse	375 V

Sections

1

Directly heated Philips gas-filled industrial rectifier for charging batteries of up to about 36 lead-acid cells. Rated for approximately 375 V peak inverse voltage and 6 A nominal rectified output.

Base

GOLIATH

Socket code

—

Electrical Summary

Heater	2.5 V / 25 A
Rectifier	15 A
V Drop	10 V
V Inverse	225 V

Sections

1

Directly heated Philips mercury-vapour or gas-filled industrial rectifier for battery charging and cinema rectifier service. Rated for approximately 225 V peak inverse voltage and 15 A nominal output.

Base

SPECIAL 3P

Socket code

—

Electrical Summary

Heater	1.9 V / 13 A
Rectifier	4 A
V Drop	12 V
V Inverse	850 V

Sections

1

Directly heated Philips mercury-vapour or gas-filled industrial rectifier for large battery-charging installations up to about 110 lead-acid cells. Rated for approximately 850 V peak inverse voltage and 4 A output.

Base

SPECIAL 3P

Socket code

—

Electrical Summary

Heater	1.9 V / 18 A
Rectifier	6 A
V Drop	12 V
V Inverse	850 V

Sections

1

Directly heated Philips mercury-vapour or gas-filled industrial rectifier for large battery-charging installations up to about 110 lead-acid cells. Rated for approximately 850 V peak inverse voltage and 6 A output.

Base

SPECIAL

Socket code

—

Electrical Summary

Heater	1.9 V / 28 A
Rectifier	15 A
V Drop	12 V
V Inverse	850 V

Sections

1

Directly heated Philips mercury-vapour or gas-filled industrial rectifier for heavy battery-charging installations up to about 110 lead-acid cells. Rated for approximately 850 V peak inverse voltage and 15 A output.

Base

SPECIAL

Socket code

—

Electrical Summary

Heater	1.9 V / 45 A
Rectifier	25 A
V Drop	12 V
V Inverse	850 V

Sections

1

Directly heated Philips mercury-vapour or gas-filled industrial rectifier for very-high-current battery-charging installations up to about 110 lead-acid cells. Rated for approximately 850 V peak inverse voltage and 25 A output.

Base

4CB

Socket code

B7G

Electrical Summary

Heater	117 V / 40 mA
Rectifier	90 mA
V Drop	22.5 V
V Inverse	330 V

Sections

1

7 pins - B7G - Miniature 7-contact

Miniature cathode-type half-wave rectifier for three-way portable receivers. Its 117 V heater permits direct line-series operation while supplying modest DC current for portable receiver power supplies.

Base

—

Socket code

B7G

Electrical Summary

Heater	117 V / 40 mA
Rectifier	90 mA
V Drop	22.5 V
V Inverse	350 V

Sections

1

7 pins - B7G - Miniature 7-contact

Single-plate half-wave rectifier for line-operated electronic supplies. Its 117 V heater construction supports direct series operation from mains-powered equipment with modest DC output requirements.

Base

5AA

Socket code

IO

Electrical Summary

Heater	117 V / 40 mA
Rectifier	90 mA
V Drop	22.5 V
V Inverse	350 V

Sections

1

6 pins - IO - International Octal

Indirectly heated half-wave rectifier for three-way portable receiver supplies. Its 117 V heater is designed for line-series operation while providing modest rectified DC output.

Base

—

Socket code

—

Electrical Summary

Heater	13 V / 12.5 A
V Inverse	140,000 V

Sections

1

Machlett directly heated high-vacuum industrial rectifier for extremely high-voltage supplies, providing approximately 140 kV peak inverse-voltage capability for demanding professional rectification.

Base

—

Socket code

—

Electrical Summary

Heater	10 V / 11.5 A
V Inverse	140,000 V

Sections

1

Machlett directly heated high-vacuum industrial rectifier for extremely high-voltage power supplies, with approximately 140 kV peak inverse-voltage capability for specialized industrial equipment.

Base

—

Socket code

SMALL4

Electrical Summary

Heater	12.6 V / 650 mA
Rectifier	70 mA
V Inverse	1,000 V

Sections

1

SMALL4 - Small 4-contact transmitting-tube base

Indirectly heated high-vacuum half-wave rectifier for conventional electronic power supplies, providing modest current with approximately 1 kV peak inverse-voltage capability.

Base

4G

Socket code

UX4

Electrical Summary

Heater	12.6 V / 300 mA
Rectifier	55 mA
V Drop	17 V
V Inverse	700 V

Sections

1

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

Indirectly heated half-wave high-vacuum rectifier designed especially for transformerless universal receivers, providing modest DC output from line-operated power supplies.

Base

—

Socket code

—

Electrical Summary

Heater	5.5 V / 6.5 A
Plate	100 W
V Drop	650 V
V Inverse	125,000 V

Sections

1

Machlett ML-141 high-vacuum industrial rectifier for very-high-voltage service, particularly electrostatic precipitation, with rugged thoriated-tungsten construction and approximately 125 kV inverse-voltage capability.

Base

—

Socket code

—

Electrical Summary

Heater	3.8 V / 6.6 A
Plate	25 W
V Drop	360 V
V Inverse	100,000 V

Sections

1

Machlett ML-142 high-vacuum rectifier for compact high-voltage industrial equipment, combining rugged thoriated-tungsten construction with up to approximately 100 kV inverse-voltage capability.

Base

—

Socket code

—

Electrical Summary

Heater	5.7 V / 6.6 A
Plate	60 W
V Drop	500 V
V Inverse	150,000 V

Sections

1

Machlett high-vacuum rectifier for very-high-voltage supplies, voltage multipliers, and capacitor-energy-storage circuits, providing approximately 150 kV inverse-voltage capability with oil insulation.

Base

—

Socket code

IO

Electrical Summary

Heater	2.5 V / 5 A
Rectifier	130 mA
V Drop	75 V
V Inverse	5,500 V

Sections

1

4 pins - IO - International Octal

RCA directly heated half-wave high-voltage rectifier for transmitting and industrial supplies, providing approximately 5.5 kV peak inverse-voltage capability and moderate DC current.

Base

—

Socket code

B7G

Electrical Summary

Heater	1.4 V / 50 mA
Ik max	20 mA
Rectifier	1 mA
V Inverse	7,000 V

Sections

1

7 pins - B7G - Miniature 7-contact

Ruggedized directly heated half-wave rectifier for very small currents at high voltage, combining exceptionally low filament power with approximately 7 kV inverse-voltage capability.

Base

2Z

Socket code

—

Electrical Summary

Heater	1.4 V / 50 mA
Ik max	1 mA
Rectifier	1 mA
V Inverse	4,300 V

Sections

1

2 pins

Low-filament-power directly heated half-wave high-vacuum rectifier for small-current high-voltage supplies, providing approximately 4.3 kV peak inverse-voltage capability.

Base

—

Socket code

—

Electrical Summary

Heater	13 V / 12.5 A
V Inverse	200,000 V

Sections

1

Machlett directly heated industrial high-vacuum rectifier for extremely high-voltage power supplies, providing approximately 200 kV peak inverse-voltage capability for specialized rectification.

Base

W

Socket code

—

Electrical Summary

Heater	1.925 V / 7 A
Rectifier	1.5 A
V Drop	10 V
V Inverse	470 V

Sections

1

Philips directly heated mercury-vapor/gas industrial half-wave rectifier for magnetic-chuck power supplies, providing high current with a low conducting voltage drop.

Base

A

Socket code

—

Electrical Summary

Heater	1.9 V / 3.5 A
Rectifier	650 mA
V Drop	10 V
V Inverse	470 V

Sections

1

Philips directly heated gas-filled industrial half-wave rectifier for magnetic-chuck supplies, providing substantial current with the low forward drop characteristic of gas-discharge rectification.

Base

GOLIATH

Socket code

—

Electrical Summary

Heater	1.925 V / 18 A
Rectifier	7.5 A
V Drop	9 V
V Inverse	300 V

Sections

1

Philips directly heated mercury-vapor/gas half-wave rectifier for charging lead-acid batteries, providing several amperes of DC output with high peak-current capability.

Base

—

Socket code

—

Electrical Summary

Heater	1.925 V / 29 A
Rectifier	12.5 A
V Drop	10 V
V Inverse	300 V

Sections

1

Philips directly heated mercury-vapor/gas high-current half-wave rectifier for cinema and related industrial supplies, providing substantial DC and peak-current capability.

Base

—

Socket code

—

Electrical Summary

Heater	50 V / 20 A
Rectifier	1.5 A
V Drop	18 V
V Inverse	10,000 V

Sections

1

High-power directly heated mercury-vapor half-wave rectifier, formerly designated 1765, for industrial high-voltage supplies requiring approximately 1.5 A DC output.

Base

—

Socket code

—

Electrical Summary

Heater	50 V / 20 A
Rectifier	1.5 A
V Drop	25 V
V Inverse	30,000 V

Sections

1

High-power directly heated mercury-vapor half-wave rectifier for industrial high-voltage supplies, combining approximately 30 kV inverse-voltage capability with 1.5 A DC output.