Electronic tube and vacuum tube catalog

Base

4D

Socket code

UX4

Electrical Summary

Heater	5 V / 250 mA
Plate	45 V
rP	30,000 Ω
gm	0.666 mA/V
μ	20

Sections

1

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

Early directly heated triode for general receiving service. Available source material confirms basic triode construction but does not establish a narrower application confidently.

Base

4D

Socket code

UX4

Electrical Summary

Heater	5 V / 250 mA
Plate	135 V
rP	10,000 Ω
gm	0.8 mA/V
μ	8

Sections

1

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

General-purpose detector and amplifier triode for early radio receivers, providing directly heated low-power signal detection and amplification.

Base

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Socket code

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Electrical Summary

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1

Russian hydrogen-filled glass baretter current regulator, stabilized current 256 (unit unspecified in datasheet), operating voltage 15 V.

Base

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Electrical Summary

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1

Russian hydrogen-filled glass baretter current regulator, stabilized current 300 (unit unspecified in datasheet), operating voltage 26 V.

Base

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Electrical Summary

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1

Russian hydrogen-filled glass baretter current regulator, stabilized current 300 (unit unspecified in datasheet), operating voltage 97.5 V.

Base

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Electrical Summary

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Russian hydrogen-filled glass baretter current regulator, stabilized current 425 (unit unspecified in datasheet), operating voltage 8.8 V.

Base

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Russian hydrogen-filled glass baretter current regulator, stabilized current 850 (unit unspecified in datasheet), operating voltage 8.8 V.

Base

B7G

Socket code

B7G

Electrical Summary

Regulator	150 V
Min/Max I	5 mA / 30 mA

Sections

1

7 pins - B7G - Miniature 7-contact

Cold-cathode gas voltage regulator providing a nominal 150 V stabilized reference over roughly 5–30 mA without heater power.

Base

B7G

Socket code

B7G

Electrical Summary

Regulator	150 V
Min/Max I	5 mA / 30 mA

Sections

1

7 pins - B7G - Miniature 7-contact

Ruggedized special-quality 150 V gas regulator for military and industrial equipment, emphasizing controlled regulation, reliability, vibration resistance, and long life.

Base

4AJ

Socket code

IO

Electrical Summary

Regulator	75 V
Min/Max I	5 mA / 40 mA

Sections

1

8 pins - IO - International Octal

Cold-cathode gas voltage regulator providing approximately 75 V stabilization over roughly 5–40 mA for shunt-regulator and reference service.

Base

Refer to variations

Socket code

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Electrical Summary

Regulator	75 V
Min/Max I	5 mA / 40 mA

Sections

1

Refer to variations

Base

4V

Socket code

IO

Electrical Summary

Plate	225 V
Ik max	25 mA

Sections

1

4 pins - IO - International Octal

Cold-cathode gas relay tube for heaterless electronic control. Gas ionization provides abrupt conduction for relay, trigger, and switching circuits.

Base

—

Socket code

B7G

Electrical Summary

Plate	1,500 V
Ik max	10 A

Sections

1

B7G - Miniature 7-contact

Cold-cathode gas-discharge electronic switch. Ionization provides abrupt heaterless conduction for trigger and control circuits.

Base

B7G

Socket code

B7G

Electrical Summary

Regulator	108 V
Min/Max I	5 mA / 30 mA

Sections

1

7 pins - B7G - Miniature 7-contact

Cold-cathode gas voltage regulator providing approximately 108 V stabilization over roughly 5–30 mA for regulated supplies and reference circuits.

Base

5B0

Socket code

B7G

Electrical Summary

Regulator	108 V
Min/Max I	5 mA / 30 mA

Sections

1

7 pins - B7G - Miniature 7-contact

Ruggedized special-quality 108 V gas regulator for dependable military and industrial voltage stabilization over approximately 5–30 mA.

Base

4AJ

Socket code

IO

Electrical Summary

Regulator	90 V
Min/Max I	10 mA / 30 mA

Sections

1

8 pins - IO - International Octal

Cold-cathode glow-discharge voltage regulator for heaterless shunt regulation and stable reference-voltage service.

Base

B7G

Socket code

B7G

Electrical Summary

Regulator	75 V
Min/Max I	5 mA / 30 mA

Sections

1

7 pins - B7G - Miniature 7-contact

Cold-cathode gas voltage regulator providing heaterless reference and shunt-regulated supply stabilization over its specified glow-current range.

Base

4AJ

Socket code

IO

Electrical Summary

Regulator	105 V
Min/Max I	5 mA / 40 mA

Sections

1

8 pins - IO - International Octal

Cold-cathode gas voltage regulator providing approximately 105 V stabilization for shunt-regulated supplies and reference-voltage circuits.

Base

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Socket code

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Electrical Summary

Regulator	105 V
Min/Max I	5 mA / 40 mA

Sections

1

Base

4AJ

Socket code

IO

Electrical Summary

Regulator	105 V
Min/Max I	5 mA / 40 mA

Sections

1

8 pins - IO - International Octal

Ruggedized cold-cathode inert-gas voltage regulator maintaining approximately 108 V over roughly 5–40 mA.

Base

4AJ

Socket code

IO

Electrical Summary

Regulator	150 V
Min/Max I	5 mA / 40 mA

Sections

1

8 pins - IO - International Octal

Cold-cathode gas voltage regulator for heaterless shunt regulation and stable reference-voltage service.

Base

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Socket code

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Electrical Summary

Regulator	150 V
Min/Max I	5 mA / 40 mA

Sections

1

Base

4AJ

Socket code

IO

Electrical Summary

Regulator	150 V
Min/Max I	5 mA / 40 mA

Sections

1

8 pins - IO - International Octal

Ruggedized special-quality 150 V gas regulator for demanding military and industrial reference or regulated-supply service.

Base

Refer to variations

Socket code

Refer to variations

Electrical Summary

Regulator	85 V
Min/Max I	4 mA / 4 mA

Sections

1

Low-current cold-cathode gas regulator providing approximately 85 V stabilization at roughly 1–8 mA for low-power reference circuits.

Base

Refer to variations

Socket code

B7G

Electrical Summary

Regulator	85 V
Min/Max I	1 mA / 10 mA

Sections

1

7 pins - B7G - Miniature 7-contact

Precision-oriented 85 V cold-cathode regulator for instrumentation and low-current reference service, with published stability, drift, temperature, and long-life characteristics.

Base

—

Socket code

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Electrical Summary

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Sections

1

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

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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

4D

Socket code

UX4

Electrical Summary

Heater	7.5 V / 1.25 A
Plate	425 V / 12 W
rP	5,150 Ω
gm	1.55 mA/V
μ	8

Sections

1

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

Directly heated receiving power triode for audio-frequency output service, with Class A operation to about 1.6 W single-ended and published push-pull Class B operation reaching roughly 25 W from a pair.

Base

B12F

Socket code

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Electrical Summary

Heater	6.3 V / 1.2 A
Plate	S1: 8,000 V

Sections

2

12 pins

Electrostatically deflected cathode-ray display tube with post-acceleration capability to 8 kV, intended for displaying electrical waveforms with separate horizontal and vertical deflection-plate drive.

Base

—

Socket code

J4

Electrical Summary

Heater	7.5 V / 15.5 A
Plate	7,500 V / 1,000 W
gm	9.05 mA/V
μ	35

Sections

1

4 pins - J4 - Jumbo 4-contact

Large transmitting triode for RF power amplification, oscillation, modulation, and audio-frequency power service. Rated for 1 kW plate dissipation, operation to about 50 MHz, and multi-kilowatt RF or push-pull audio output.

Base

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Socket code

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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

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

—

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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Electrical Summary

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1

Base

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Electrical Summary

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Sections

1

Base

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Electrical Summary

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Sections

1

Base

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Socket code

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Electrical Summary

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Sections

1

Permanent-sensitivity argon-filled Geiger-Müller counter with a thin mica window for beta and X-ray detection. It operates around 1.2 kV and provides a broad counting plateau with approximately 200 µs dead time.

Base

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Socket code

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Electrical Summary

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Sections

1

Permanent-sensitivity argon-filled Geiger-Müller counter with a thin mica window for beta and X-ray detection. The based version operates around 1.2 kV with a broad plateau and approximately 200 µs dead time.

Base

—

Socket code

B4

Electrical Summary

Regulator	100 V
Min/Max I	50 mA / 200 mA

Sections

1

B4 - European 4-pin base

Heavy-current neon voltage stabilizer providing approximately 100 V over roughly 50–200 mA for robust shunt-regulated power supplies.

Base

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Socket code

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Electrical Summary

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Sections

1

Neon-filled self-quenching Geiger-Müller counter with a thin mica window for beta detection. It operates around 700 V and provides a broad counting plateau with approximately 200 µs dead time.

Base

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Socket code

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Electrical Summary

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Sections

1

Based version of the neon-filled self-quenching Geiger-Müller counter for beta detection, using a thin mica window and broad operating plateau for general radiation-counting instrumentation.

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

Refer to variations

Socket code

MEDIUM4BAYONET

Electrical Summary

Heater	5 V / 6.3 A
Plate	3,000 V / 100 W
gm	4.5 mA/V
μ	38

Sections

1

4 pins - MEDIUM4BAYONET - Medium 4-contact bayonet base

High-mu transmitting power triode for Class C RF amplification or oscillation and Class B audio/modulator service. Rated for 100 W plate dissipation, operation to about 40 MHz, and several hundred watts output under published conditions.

Base

—

Socket code

MEDIUM4BAYONET

Electrical Summary

Heater	5 V / 6.3 A
Plate	3,000 V / 100 W
gm	3 mA/V
μ	14

Sections

1

4 pins - MEDIUM4BAYONET - Medium 4-contact bayonet base

Low-mu Eimac transmitting power triode intended for RF amplifier, oscillator, and modulator service. Its published operating data cover substantial Class C RF output and audio/modulator operation at plate voltages up to several kilovolts.

Base

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Socket code

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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.