Electronic tube and vacuum tube catalog

Base

8AV

Socket code

IO

Electrical Summary

Heater	117 V / 90 mA
Plate	S2: 117 V / 6 W
Screen	S2: 117 V / 1 W
Rectifier	S1: 75 mA
V Drop	S1: 16 V
V Inverse	S1: 350 V
rP	S2: 17,000 Ω
gm	S2: 5.3 mA/V

Sections

2

8 pins - IO - International Octal

Brimar combination tube containing a rectifier section and a power tetrode, using a 117 V series heater. It integrates rectification and output amplification in one envelope for compact mains-powered equipment.

Base

—

Socket code

B9A

Electrical Summary

Heater	12.6 V / 420 mA
Plate	S1: 300 V / 5 WS2: 300 V / 5 W
Screen	S1: 200 V / 1 WS2: 200 V / 1 W
Ik max	S1: 225 mAS2: 225 mA
gm	S1: 3.3 mA/VS2: 3.3 mA/V

Sections

2

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

Indirectly heated double high-frequency tetrode, internally neutralized for push-pull amplification to approximately 225 MHz. Two tetrode sections provide balanced RF power amplification in one envelope.

Base

—

Socket code

—

Electrical Summary

Heater	12.6 V / 900 mA
Plate	S1: 750 V / 20 WS2: 750 V / 20 W
Screen	S1: 300 VS2: 300 V
gm	S1: 4.5 mA/VS2: 4.5 mA/V

Sections

2

7 pins

Internally neutralized double high-frequency tetrode designed for push-pull amplification or frequency-tripler service to approximately 500 MHz. Two RF tetrode sections share one envelope.

Base

—

Socket code

—

Electrical Summary

Heater	12.6 V / 650 mA
Plate	S1: 600 V / 10 WS2: 600 V / 10 W
Screen	S1: 300 VS2: 300 V
gm	S1: 3 mA/VS2: 3 mA/V

Sections

2

7 pins

Internally neutralized double high-frequency tetrode with center-tapped heater, designed for push-pull amplification or frequency-tripler service to approximately 600 MHz.

Base

9NV

Socket code

B9A

Electrical Summary

Heater	12.6 V / 150 mA
Plate	S2: 30 V / 5 W
Screen	S2: 30 V
Rectifier	S1: 10 mA
rP	S2: 41,000 Ω

Sections

2

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

Combined detector diode and power tetrode sharing a common cathode. The tetrode is designed for low-voltage power amplification directly from an automotive battery, while the diode provides signal detection.

Base

—

Socket code

MEDIUM4BAYONET

Electrical Summary

Heater	5 V / 3.25 A
Plate	750 V / 20 W
Screen	5 W
Ik max	60 mA
rP	80,000 Ω
gm	1 mA/V
μ	80

Sections

1

4 pins - MEDIUM4BAYONET - Medium 4-contact bayonet base

Western Electric thoriated-tungsten transmitting tetrode rated for Class-B RF service with approximately 10 W catalog output. Designed for radio-frequency power amplification.

Base

—

Socket code

MEDIUM4BAYONET

Electrical Summary

Heater	7.5 V / 3.25 A
Plate	750 V / 25 W
Screen	5 W
Ik max	75 mA
rP	86,000 Ω
gm	1.16 mA/V
μ	100

Sections

1

4 pins - MEDIUM4BAYONET - Medium 4-contact bayonet base

Western Electric thoriated-tungsten transmitting tetrode rated for Class-B RF service with approximately 12.5 W catalog output. Designed for radio-frequency power amplification.

Base

—

Socket code

J4

Electrical Summary

Heater	10 V / 3 A
Plate	1,000 V / 70 W
Screen	250 V / 5 W
Ik max	100 mA
rP	70,000 Ω
gm	1.43 mA/V
μ	100

Sections

1

4 pins - J4 - Jumbo 4-contact

Air-cooled transmitting tetrode designed for Class-B RF service. Its construction and operating ratings support radio-frequency power amplification in transmitter equipment.

Base

—

Socket code

—

Electrical Summary

Heater	10 V / 3.1 A
Plate	1,000 V / 60 W

Sections

1

Air-cooled transmitting tetrode designed for Class-B RF service. Its power construction supports professional radio-frequency amplification rather than receiving-type operation.

Base

—

Socket code

UY5

Electrical Summary

Heater	6.3 V / 1.6 A
Plate	600 V / 30 W
gm	6.4 mA/V

Sections

1

5 pins - UY5 - Medium 5-contact

Western Electric air-cooled heater-cathode transmitting tetrode designed for RF power service. Its construction supports professional radio-frequency amplifier operation.

Base

—

Socket code

IO

Electrical Summary

Heater	6.3 V / 1.6 A
Plate	400 V / 25 W
Ik max	125 mA
gm	6.25 mA/V

Sections

1

8 pins - IO - International Octal

Western Electric air-cooled heater-cathode tetrode designed for RF power service. Manufacturer documentation identifies it as a transmitting-class radio-frequency output device.

Base

—

Socket code

IO

Electrical Summary

Heater	6.3 V / 1.7 A
Plate	1,500 V / 15 W
Screen	300 V / 2 W
gm	5.8 mA/V

Sections

1

8 pins - IO - International Octal

High-vacuum beam-power tube designed primarily for blocking-oscillator and pulse-modulator service, also usable as a deflection amplifier where short high-power pulses are required.

Base

—

Socket code

—

Electrical Summary

Heater	6.3 V / 1.7 A
Plate	3,500 V / 15 W
Screen	850 V / 3 W
gm	0.55 mA/V

Sections

1

Base

Refer to variations

Socket code

Refer to variations

Electrical Summary

Heater	6.3 V / 3 A
Plate	2,000 V / 35 W
Screen	400 V
gm	2.75 mA/V
μ	65

Sections

1

4 pins

Lewis Electronics 3D23 directly heated thoriated-tungsten multi-electrode RF transmitting power tube, provisionally classified as a tetrode, with 6.3 V 3 A filament and Class C output around 130 W.

Base

—

Socket code

B8G

Electrical Summary

Heater	6.3 V / 3 A
Plate	2,000 V / 45 W
Screen	400 V / 10 W
Ik max	100 mA
μ	50

Sections

1

8 pins - B8G - Loctal 8-contact

High-efficiency air-cooled transmitting tetrode designed for VHF RF power service, providing substantial output at high radio frequencies.

Base

—

Socket code

B5

Electrical Summary

Heater	5 V / 1.6 A
Plate	250 V / 45 W
Screen	65 V
Ik max	45 mA
rP	3,600 Ω
μ	5.3

Sections

1

5 pins - B5 - European 5-pin base

Coplanar-grid power tetrode published under the 4045A designation. Its specialized grid geometry supports high-frequency power operation in professional electronic equipment.

Base

—

Socket code

UX4

Electrical Summary

Heater	10 V / 3.25 A
Plate	3,000 V / 100 W
Screen	15 W
Ik max	100 mA
rP	175,000 Ω

Sections

1

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

Standard Valves directly heated tetrode with published operating data. Its filamentary construction and power ratings support output-stage service rather than ordinary small-signal amplification.

Base

—

Socket code

—

Electrical Summary

Heater	10 V / 15.6 A
Plate	750 V / 75 W
Screen	600 V / 50 W
Ik max	600 mA
rP	105,000 Ω

Sections

1

Standard Valves directly heated tetrode with manufacturer-published operating data. Its filamentary construction supports power-output applications in professional electronic equipment.

Base

—

Socket code

UX4

Electrical Summary

Heater	10 V / 3 A
Plate	1,000 V / 70 W
Screen	250 V / 5 W
Ik max	100 mA
rP	70,000 Ω

Sections

1

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

Standard Valves directly heated tetrode with published electrical and operating data. Its power construction supports output-stage service rather than receiving-type small-signal amplification.

Base

—

Socket code

UX4

Electrical Summary

Heater	10 V / 3 A
Plate	1,000 V / 70 W
Screen	250 V / 5 W
Ik max	100 mA
rP	70,000 Ω

Sections

1

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

Standard Valves directly heated tetrode variant with manufacturer-published operating data. Its filamentary construction supports power-output applications in professional equipment.

Base

—

Socket code

UX4

Electrical Summary

Heater	10 V / 3.1 A
Plate	1,000 V / 60 W
Screen	200 V / 6 W
Ik max	125 mA
rP	40,000 Ω
gm	4 mA/V

Sections

1

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

Standard Valves directly heated tetrode with published operating data. Its power-capable construction is intended for output-stage service rather than ordinary voltage amplification.

Base

5C

Socket code

UX5

Electrical Summary

Heater	2.5 V / 1.75 A
Plate	400 V / 10 W
Ik max	200 mA
rP	2,380 Ω
gm	2.35 mA/V
μ	5.6

Sections

1

5 pins - UX5 - Small 5-contact

Directly heated dual-grid power-amplifier tetrode designed especially for Class-B audio-output service. Its filamentary construction provides substantial low-frequency power in push-pull amplifier stages.

Base

Refer to variations

Socket code

SEPTAR5

Electrical Summary

Heater	6 V / 3.5 A
Plate	3,000 V / 65 W
Screen	600 V / 10 W
Ik max	150 mA
gm	4 mA/V
μ	6

Sections

1

5 pins - SEPTAR5 - Septar 5-contact transmitting-tube base family

Fast-heating thoriated-tungsten transmitting tetrode designed for mobile RF service. Its rapid warm-up supports radio-frequency power equipment requiring quick availability.

Base

—

Socket code

—

Electrical Summary

Heater	6 V / 2.85 A
Plate	2,500 V / 15 W
Screen	400 V / 12 W
Ik max	250 mA
gm	12 mA/V

Sections

1

Metal-ceramic RF power tetrode designed for CW and low-duty pulse amplification, oscillator operation, and single-sideband linear amplification. Its compact professional construction supports versatile transmitting service.

Base

—

Socket code

—

Electrical Summary

Heater	2.1 V / 7.625 A
Plate	S1: 2,000 V / 100 WS2: 130 V / 0.5 W
Screen	S1: 400 V / 8 W
Ik max	S1: 300 mA
rP	S2: 1,200 Ω
gm	S1: 20 mA/V
μ	S1: 11.5

Sections

2

Eimac metal-ceramic quick-heating power tetrode with a built-in control diode for portable and mobile transmitters. The integrated diode permits rapid operation with minimal auxiliary circuitry.

Base

—

Socket code

—

Electrical Summary

Heater	26 V / 2.25 A
Plate	20,000 V / 60 W
Screen	1,500 V / 8 W
Ik max	18 A

Sections

1

High-vacuum pulse tetrode rated around 20 kV plate voltage and 18 A peak current, capable of approximately 300 kW pulse output for modulator service.

Base

Refer to variations

Socket code

Refer to variations

Electrical Summary

Heater	26 V / 2.1 A
Plate	20,000 V / 60 W
Screen	1,500 V / 8 W
Ik max	18 A

Sections

1

Eimac 8252 high-vacuum pulse-modulator tetrode for inductive or resistive loads, rated around 20 kV DC and 18 A peak plate current.

Base

Refer to variations

Socket code

Refer to variations

Electrical Summary

Heater	26 V / 2.1 A
Plate	20,000 V / 60 W
Screen	1,500 V / 8 W
Ik max	18 A

Sections

1

Eimac 8252W high-vacuum pulse-modulator tetrode for inductive or resistive loads, optimized for powerful short-duration pulses at approximately 20 kV plate voltage.

Base

—

Socket code

—

Electrical Summary

Heater	6.3 V / 3.75 A
Plate	800 V / 60 W
Screen	350 V
Ik max	250 mA

Sections

1

Mazda transmitting tetrode providing roughly 110 W Class C RF output from a 750 V plate supply.

Base

—

Socket code

—

Electrical Summary

Heater	6.3 V / 3.975 A
Plate	750 V / 60 W
Screen	350 V / 14 W
Ik max	250 mA

Sections

1

Mazda RF power tetrode designed for transmitting service to approximately 60 MHz.

Base

—

Socket code

—

Electrical Summary

Heater	12.6 V / 3.6 A
Plate	800 V / 60 W
Screen	350 V / 15 W

Sections

1

Dual transmitting tetrode assembly whose parallel sections can produce approximately 220 W Class C RF output.

Base

—

Socket code

—

Electrical Summary

Heater	12.6 V / 3.5 A
Plate	800 V / 80 W
Screen	7.5 W
rP	550 Ω
gm	20 mA/V
μ	11

Sections

1

Mazda power tetrode for substantial power-amplifier and series-regulator applications.

Base

—

Socket code

—

Electrical Summary

Heater	6.3 V / 900 mA
Plate	600 V / 25 W
Screen	300 V
Ik max	100 mA

Sections

1

807-family transmitting tetrode for RF amplification, oscillator, modulator, and audio-frequency power service.

Base

—

Socket code

—

Electrical Summary

Heater	6.3 V / 1.45 A
Plate	600 V / 35 W
Screen	275 V / 7 W

Sections

1

Beam-power tetrode designed for high-frequency amplifier service, providing a power stage for RF applications.

Base

—

Socket code

—

Electrical Summary

Heater	6.3 V / 1.5 A
Plate	800 V / 30 W
Screen	250 V
gm	6.5 mA/V

Sections

1

Indirectly heated transmitting tetrode for medium-power radio-frequency amplification.

Base

—

Socket code

—

Electrical Summary

Heater	6.3 V / 3.2 A

Sections

1

Rugged dual beam tetrode intended for high-frequency amplifier and oscillator service, combining two power sections for demanding RF applications.

Base

—

Socket code

—

Electrical Summary

Heater	6.3 V / 1.65 A
Plate	800 V / 35 W
Screen	400 V / 4.5 W
Ik max	200 mA
gm	10 mA/V
μ	4.5

Sections

1

Power tetrode for audio-frequency amplification and high-voltage series-regulator service.

Base

Refer to variations

Socket code

SEPTAR7

Electrical Summary

Heater	12.6 V / 900 mA
Plate	S1: 600 V / 45 WS2: 600 V / 45 W
Screen	S1: 250 VS2: 250 V
μ	S1: 8.2S2: 8.2

Sections

2

7 pins - SEPTAR7 - Septar 7-contact base

High-frequency twin power tetrode for RF multiplier, amplifier, and modulator service, with transmitting ratings and forced-air or radiation cooling.

Base

Refer to variations

Socket code

Refer to variations

Electrical Summary

Heater	6.3 V / 680 mA
Plate	S1: 600 V / 8 WS2: 600 V / 8 W
Screen	S1: 250 VS2: 250 V
Ik max	S1: 240 mAS2: 240 mA
μ	S1: 7.5S2: 7.5

Sections

2

Twin directly heated RF power tetrode for amplifier, oscillator, modulator, and frequency-multiplier service.

Base

—

Socket code

B4A

Electrical Summary

Heater	26 V / 2 A
Plate	20,000 V / 60 W
Screen	1,250 V / 8 W
Ik max	30 mA

Sections

1

4 pins - B4A - 4-contact B4A physical base

Heater-cathode pulse-amplifier tetrode designed for high-current pulse service, with a published peak anode-current rating of 15 amperes into a non-inductive load.

Base

—

Socket code

—

Electrical Summary

Heater	6.3 V / 24 A
Plate	2,000 W
Screen	500 V
Ik max	650 mA

Sections

1

Water-cooled grounded-grid UHF tetrode for kilowatt-class television power-amplifier and oscillator service.

Base

—

Socket code

—

Electrical Summary

Heater	10 V / 9.7 A
Plate	500 W
μ	9.5

Sections

1

Low-drive high-frequency transmitting tetrode for FM/AM RF amplifiers and screen-modulator stages.

Base

—

Socket code

—

Electrical Summary

Heater	120 V / 1.55 A

Sections

1

Forced-air-cooled UHF power tetrode.

Base

Refer to variations

Socket code

Refer to variations

Electrical Summary

Heater	12.6 V / 650 mA
Plate	600 V / 10 W
Screen	250 V
Ik max	55 mA
gm	2.5 mA/V
μ	8.5

Sections

1

Twin high-frequency tetrode developed from the 832A for RF amplifier, frequency-multiplier, and modulator service. Its paired tetrode structure supports balanced high-frequency power circuits.

Base

—

Socket code

—

Electrical Summary

Heater	12.6 V / 650 mA
Plate	25 W
μ	8.5

Sections

1

U.S. Navy designation of the 6252 twin high-frequency tetrode, intended for RF amplifier, frequency-multiplier, and modulator service in military communications equipment.

Base

E9-1

Socket code

B9A

Electrical Summary

Heater	12.6 V / 400 mA
Plate	300 V / 14 W
Screen	200 V / 2 W
Ik max	50 mA
rP	3,900 Ω
gm	3.3 mA/V
μ	18

Sections

1

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

High-gain twin tetrode designed for Class-C amplifier, oscillator, and frequency-multiplier service. Its paired RF sections support compact high-frequency power generation and multiplication.

Base

—

Socket code

—

Electrical Summary

Heater	12.6 V / 410 mA
Plate	300 V / 14 W
μ	7.5

Sections

1

High-gain twin tetrode for Class-C amplifier, oscillator, frequency-multiplier, and modulator service, rated to roughly 200 MHz at full input. Designed for versatile VHF power circuits.

Base

9V

Socket code

—

Electrical Summary

Heater	6.3 V / 300 mA
Plate	180 V / 2,000 W
Screen	750 V
rP	1,800 Ω
gm	4 mA/V
μ	20

Sections

1

9 pins

Metal-ceramic four-electrode transmitting tetrode for grounded-grid RF power amplifier or oscillator service through approximately 800 MHz, with an integral forced-air-cooled anode radiator.

Base

—

Socket code

—

Electrical Summary

Heater	12.6 V / 650 mA
Plate	S1: 600 V / 10 WS2: 600 V / 10 W
gm	S1: 2.5 mA/VS2: 2.5 mA/V
μ	S1: 8S2: 8

Sections

2

Special Amperex radiation-cooled twin tetrode, developed as a high-frequency 832A variant for mobile RF amplification, frequency multiplication, and modulation service.

Base

6AM

Socket code

UX6

Electrical Summary

Heater	6.3 V / 900 mA
Plate	350 V / 18.6 W
Screen	300 V / 3.7 W
rP	22,500 Ω
gm	6 mA/V

Sections

1

6 pins - UX6 - Small 6-contact

Heater-type tetrode power amplifier designed for Class-A and general power-amplifier service. Its output capability supports low-frequency or general-purpose load-driving applications.