Electronic tube and vacuum tube catalog

Base

—

Socket code

B9E

Electrical Summary

Heater	9.7 V / 600 mA
Plate	S1: 330 V / 1.5 WS2: 330 V / 10 W
rP	S1: 40,000 ΩS2: 1,000 Ω
gm	S1: 1.5 mA/VS2: 7 mA/V
μ	S1: 60S2: 6

Sections

2

9 pins - B9E - Novar 9-contact

Dissimilar dual triode combining a high-mu voltage-amplifier section with a low-mu 10 W power section, derived from the GF7 family for demanding driver and output applications.

Base

—

Socket code

—

Electrical Summary

Heater	6.3 V / 2.5 A
Plate	S1: 550 V / 13 WS2: 550 V / 13 W
Ik max	S1: 125 mAS2: 125 mA
rP	S1: 280 ΩS2: 280 Ω
gm	S1: 7 mA/VS2: 7 mA/V
μ	S1: 2S2: 2

Sections

2

8 pins

Dual low-mu power triode designed for booster-scanning circuits and series-regulator service in DC power supplies. Its sections withstand severe pulse conditions, including kilovolt-level inverse and control-grid pulse voltages.

Base

12E0

Socket code

B12C

Electrical Summary

Heater	11 V / 450 mA
Plate	S1: 330 V / 1 WS2: 275 V / 7 W
Ik max	S1: 20 mAS2: 50 mA
rP	S1: 40,500 ΩS2: 920 Ω
gm	S1: 1.6 mA/VS2: 6.5 mA/V
μ	S1: 65S2: 6

Sections

2

12 pins - B12C - Duodecar 12-contact

Dissimilar dual triode, electrically equivalent to 6FY7/15FY7 apart from heater characteristics, combining a high-mu section with a low-mu, pulse-capable power output section.

Base

8B

Socket code

IO

Electrical Summary

Heater	6.3 V / 600 mA
Plate	S1: 300 V / 3 WS2: 300 V / 3 W

Sections

2

8 pins - IO - International Octal

High-mu twin triode intended for audio amplification and Class-B power-amplifier service, combining two triode units in one envelope for push-pull output operation.

Base

6C

Socket code

UX4

Electrical Summary

Heater	2 V / 260 mA
Plate	S1: 135 VS2: 135 V
Ik max	S1: 50 mAS2: 50 mA

Sections

2

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

Twin triode designed as a Class-B push-pull power amplifier for battery receivers, with the two triode units operated together to deliver approximately two watts of audio output.

Base

—

Socket code

IO

Electrical Summary

Heater	1.4 V / 100 mA
Plate	S1: 90 VS2: 90 V
Ik max	S1: 20 mAS2: 20 mA
rP	S1: 43,000 ΩS2: 43,000 Ω
gm	S1: 0.675 mA/VS2: 0.675 mA/V
μ	S1: 30S2: 30

Sections

2

8 pins - IO - International Octal

Directly heated twin triode designed as a Class-B push-pull power amplifier for battery-operated receivers, using two triode units together for economical audio-output service.

Base

7AB

Socket code

IO

Electrical Summary

Heater	1.4 V / 100 mA
Plate	S1: 110 VS2: 110 V
Ik max	S1: 20 mAS2: 20 mA
rP	S1: 40,000 ΩS2: 40,000 Ω
gm	S1: 0.825 mA/VS2: 0.825 mA/V
μ	S1: 33S2: 33

Sections

2

8 pins - IO - International Octal

Directly heated twin-triode power amplifier for battery receivers, designed for Class-B push-pull audio output from a low-voltage 1.4 V filament supply.

Base

7AB

Socket code

IO

Electrical Summary

Heater	2 V / 240 mA
Plate	S1: 135 VS2: 135 V
Ik max	S1: 50 mAS2: 50 mA

Sections

2

8 pins - IO - International Octal

Directly heated twin triode intended for Class-B push-pull audio power amplification in battery receivers, with both triode units cooperating as the output stage.

Base

7AB

Socket code

—

Electrical Summary

Heater	2 V / 240 mA
Plate	S1: 135 VS2: 135 V

Sections

2

7 pins

Directly heated twin-triode power amplifier intended for Class-B push-pull battery-receiver service, using a 2.0 V filament and delivering about two watts of audio output.

Base

6DA

Socket code

UX6

Electrical Summary

Heater	25 V / 300 mA
Plate	S1: 180 V
rP	S1: 11,400 Ω
gm	S1: 2.2 mA/VS2: 2.3 mA/V
μ	S1: 25S2: 35

Sections

2

6 pins - UX6 - Small 6-contact

Dual-triode dynamic-coupled power-output tube for high-quality audio in AC/DC receivers, combining driver and output functions in one envelope.

Base

G-7WQ

Socket code

IO

Electrical Summary

Heater	25 V / 300 mA
Plate	S1: 180 V
rP	S1: 11,400 Ω
gm	S1: 2.2 mA/V
μ	S1: 25

Sections

2

8 pins - IO - International Octal

Octal dual-triode dynamic-coupled power-output tube for high-quality AC/DC receiver audio, functionally corresponding to the 25B5.

Base

—

Socket code

MEDIUM7

Electrical Summary

Heater	6.3 V / 800 mA
Plate	S1: 300 V / 5 WS2: 300 V / 5 W
Ik max	S1: 50 mAS2: 50 mA
rP	S1: 4,700 ΩS2: 4,700 Ω
μ	S1: 14S2: 14

Sections

2

7 pins - MEDIUM7 - Medium 7-contact transmitting-tube base

Twin power triode containing two identical sections for high-frequency RF amplification. The paired systems provide compact push-pull transmitter operation, with published output around 14 W and useful service extending to approximately 300 MHz.

Base

—

Socket code

MEDIUM7

Electrical Summary

Heater	6.3 V / 800 mA
Plate	S1: 300 V / 5 WS2: 300 V / 5 W
Ik max	S1: 50 mAS2: 50 mA
rP	S1: 4,700 ΩS2: 4,700 Ω
gm	S1: 2.97872 mA/VS2: 2.97872 mA/V
μ	S1: 14S2: 14

Sections

2

7 pins - MEDIUM7 - Medium 7-contact transmitting-tube base

Twin power triode with identical sections usable in parallel or push-pull audio and RF stages. Published conditions cover Class A and Class B audio output as well as Class C transmitting service around 14 W.

Base

—

Socket code

SEPTAR7

Electrical Summary

Heater	12.6 V / 1.125 A
Plate	S1: 15 WS2: 15 W
μ	S1: 11S2: 11

Sections

2

SEPTAR7 - Septar 7-contact base

Twin high-perveance power triode developed for industrial control-amplifier and voltage-regulator service, combining two power sections suited to substantial current handling and series-pass regulation.

Base

—

Socket code

—

Electrical Summary

Heater	6.3 V / 660 mA
Plate	S1: 1,100 V / 9 WS2: 1,100 V / 9 W
Ik max	S2: 2 A

Sections

2

Integrated dual-triode L-band oscillator-amplifier assembly specifically designed for 1090 MHz airborne transponder service. Separate oscillator and amplifier sections share one compact assembly, providing pulsed microwave transmission for aircraft identification equipment.

Base

—

Socket code

—

Electrical Summary

Heater	6.3 V / 660 mA
Plate	S1: 1,050 V / 9 WS2: 1,050 V / 9 W
Ik max	S1: 700 mAS2: 2 A

Sections

2

Integrated pencil-tube oscillator-amplifier assembly for pulsed 1090 MHz transponder service. The amplifier section delivers several hundred watts of peak output while its companion section supplies the associated L-band oscillator function.

Base

—

Socket code

—

Electrical Summary

Heater	6.3 V / 660 mA
Plate	S1: 1,050 V / 9 WS2: 1,050 V / 9 W
Ik max	S1: 700 mAS2: 2 A

Sections

2

Dual UHF/L-band pulse triode assembly for paired oscillator and amplifier operation near 1090 MHz. The amplifier section provides several hundred watts of peak output while the companion oscillator operates across the same narrow transponder-frequency range.

Base

—

Socket code

MEDIUM7

Electrical Summary

Heater	6.3 V / 800 mA
Plate	S1: 300 V / 5 WS2: 300 V / 5 W
Ik max	S1: 50 mAS2: 50 mA
rP	S1: 4,700 ΩS2: 4,700 Ω
gm	S1: 2.97872 mA/VS2: 2.97872 mA/V
μ	S1: 14S2: 14

Sections

2

7 pins - MEDIUM7 - Medium 7-contact transmitting-tube base

Dual power triode for both audio and RF applications. Its paired sections support push-pull Class B or paralleled Class A audio operation, while reduced-rating RF service extends into the UHF region near 300 MHz.

Base

B8-11

Socket code

UX4

Electrical Summary

Heater	6.3 V / 2.4 A
Plate	S1: 250 V / 13 WS2: 250 V / 13 W
Ik max	S1: 125 mAS2: 125 mA
rP	S1: 65 ΩS2: 65 Ω
gm	S1: 20 mA/VS2: 20 mA/V
μ	S1: 1.3S2: 1.3

Sections

2

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

Low-mu double power triode with separate cathodes, intended primarily as a series-pass tube in regulated rectifier supplies, providing high-current control capability in voltage-regulator circuits.

Base

B8-11

Socket code

IO

Electrical Summary

Heater	6.3 V / 2.4 A
Plate	S1: 275 V / 15 WS2: 275 V / 15 W
Ik max	S1: 140 mAS2: 140 mA
rP	S1: 350 ΩS2: 350 Ω
gm	S1: 14 mA/VS2: 14 mA/V
μ	S1: 5.5S2: 5.5

Sections

2

8 pins - IO - International Octal

Medium/low-mu twin power triode designed primarily as a series-pass tube in regulated power supplies. Its low plate resistance and high transconductance provide substantial current at comparatively small tube voltage drop.

Base

8BD

Socket code

IO

Electrical Summary

Heater	6.3 V / 2.4 A
Plate	S1: 275 V / 15 WS2: 275 V / 15 W
Ik max	S1: 140 mAS2: 140 mA
rP	S1: 350 ΩS2: 350 Ω
gm	S1: 15.5 mA/VS2: 15.5 mA/V
μ	S1: 5.4S2: 5.4

Sections

2

8 pins - IO - International Octal

Low-mu twin power triode designed for series-regulator service in DC power supplies. Electrically related to the 5998 but using a different envelope and base, it emphasizes high current and very low plate resistance.

Base

8BD

Socket code

IO

Electrical Summary

Heater	6.3 V / 2.5 A
Plate	S1: 250 V / 13 WS2: 250 V / 13 W
Ik max	S1: 150 mAS2: 150 mA
rP	S1: 280 ΩS2: 280 Ω
gm	S1: 7 mA/VS2: 7 mA/V
μ	S1: 2S2: 2

Sections

2

8 pins - IO - International Octal

High-current dual power triode designed for series-voltage-regulator and power-control service. Its identical low-mu sections have very low plate resistance, emphasizing current handling and low voltage drop rather than voltage amplification.

Base

—

Socket code

IO

Electrical Summary

Heater	6.3 V / 2.5 A
Plate	S1: 250 V / 13 WS2: 250 V / 13 W
Ik max	S1: 150 mAS2: 150 mA

Sections

2

8 pins - IO - International Octal

High-current, very low-mu dual power triode designed for series-pass voltage-regulator circuits, with substantial plate dissipation and current capability in each section.

Base

—

Socket code

IO

Electrical Summary

Heater	6.3 V / 2.5 A
Plate	S1: 250 V / 13 WS2: 250 V / 13 W
Ik max	S1: 125 mAS2: 125 mA
gm	S1: 7 mA/VS2: 7 mA/V
μ	S1: 2S2: 2

Sections

2

8 pins - IO - International Octal

Ruggedized high-current dual power triode for series-regulator service, designed for severe mechanical environments and capable of operating its two sections in parallel as a pass element.

Base

—

Socket code

IO

Electrical Summary

Heater	6.3 V / 2.5 A
Plate	S1: 250 V / 13 WS2: 250 V / 13 W
Ik max	S1: 200 mAS2: 200 mA
gm	S1: 7 mA/VS2: 7 mA/V
μ	S1: 2S2: 2

Sections

2

8 pins - IO - International Octal

High-reliability rugged dual power triode for series-regulator and mobile-equipment service, combining very low amplification factor with high cathode-current and plate-dissipation capability.

Base

8BD

Socket code

IO

Electrical Summary

Heater	26.5 V / 600 mA
Plate	S1: 250 V / 13 WS2: 250 V / 13 W
Ik max	S1: 125 mAS2: 125 mA
rP	S1: 280 ΩS2: 280 Ω
gm	S1: 7 mA/VS2: 7 mA/V

Sections

2

8 pins - IO - International Octal

Low-mu twin power triode intended for regulator and DC-amplifier service under shock and vibration, with high-current sections and low plate resistance.

Base

B8-94

Socket code

IO

Electrical Summary

Heater	26.5 V / 600 mA
Plate	S1: 250 V / 13 WS2: 250 V / 13 W
gm	S1: 7 mA/VS2: 7 mA/V
μ	S1: 2S2: 2

Sections

2

8 pins - IO - International Octal

Ruggedized low-mu twin power triode for voltage-regulator and DC-amplifier applications, providing two high-current, low-resistance sections for demanding control service.

Base

—

Socket code

—

Electrical Summary

Heater	6.3 V / 4.75 A

Sections

2

High-current dual power triode designed primarily for stabilized power supplies. Its two low-resistance, high-transconductance sections control large DC current with relatively little voltage drop, making the tube especially suited to series-pass regulation and power-control circuits.

Base

7B

Socket code

UX5

Electrical Summary

Heater	6.3 V / 800 mA
Plate	S1: 300 V / 2.5 WS2: 300 V / 2.5 W
Ik max	S1: 60 mAS2: 60 mA
rP	S1: 11,000 ΩS2: 11,000 Ω
gm	S1: 2.6 mA/VS2: 2.6 mA/V
μ	S1: 35S2: 35

Sections

2

7 pins - UX5 - Small 5-contact

Double power triode used chiefly for Class-B output service in AC receivers; its sections may also be paralleled as a Class-A driver or operated separately as voltage amplifiers.

Base

—

Socket code

OCTAL7

Electrical Summary

Heater	6.3 V / 500 mA
Plate	S1: 250 V
rP	S1: 40,000 Ω
gm	S1: 1.8 mA/V
μ	S1: 72

Sections

2

7 pins - OCTAL7 - 7-contact octal-family base

Triadyne dynamic-coupled power-output tube developed for automobile radios, with Class-A and push-pull operating data and reduced heater power.

Base

—

Socket code

OCTAL7

Electrical Summary

Heater	6.3 V / 1.1 A
Plate	S1: 180 V
rP	S1: 18,000 Ω
gm	S1: 3 mA/V
μ	S1: 54

Sections

2

8 pins - OCTAL7 - 7-contact octal-family base

Triadyne power-output tube for small AC receivers using approximately 180 V plate supplies, with single-ended Class-A and push-pull audio operation.

Base

7W

Socket code

IO

Electrical Summary

Heater	6.3 V / 1.1 A
Plate	S1: 180 V
rP	S1: 18,000 Ω
gm	S1: 3 mA/V
μ	S1: 54

Sections

2

8 pins - IO - International Octal

Dynamic-coupled twin-triode power amplifier whose internally connected input and output triodes provide high plate efficiency for Class-A audio power-output service.

Base

8BD

Socket code

IO

Electrical Summary

Heater	6.3 V / 2.5 A
Plate	S1: 250 V / 13 WS2: 250 V / 13 W
rP	S1: 280 ΩS2: 280 Ω
gm	S1: 5.5 mA/VS2: 5.5 mA/V

Sections

2

8 pins - IO - International Octal

Dual low-mu high-current power triode developed primarily for series-pass voltage-regulator service. Very low plate resistance and substantial current capability make its two sections effective control elements in stabilized DC supplies and other high-current circuits.

Base

8BD

Socket code

IO

Electrical Summary

Heater	6.3 V / 2.5 A
Plate	S1: 250 V / 13 WS2: 250 V / 13 W
Ik max	S1: 125 mAS2: 125 mA
rP	S1: 280 ΩS2: 280 Ω
gm	S1: 7 mA/VS2: 7 mA/V
μ	S1: 2S2: 2

Sections

2

8 pins - IO - International Octal

Low-mu twin power triode designed principally for series-regulator service in DC power supplies, with additional high-current pulse applications. Very low plate resistance and high current capability characterize both sections.

Base

8BD

Socket code

IO

Electrical Summary

Heater	6.3 V / 2.5 A
Plate	S1: 250 V / 13 WS2: 250 V / 13 W
Ik max	S1: 125 mAS2: 125 mA
V Inverse	S1: 1,700 V
rP	S1: 280 ΩS2: 280 Ω
gm	S1: 7 mA/VS2: 7 mA/V
μ	S1: 2S2: 2

Sections

2

8 pins - IO - International Octal

Low-mu twin power triode designed principally for series-regulator service. Each section combines high current capability, low plate resistance, and approximately 13 W dissipation, while published pulse ratings support additional high-current applications.

Base

8BD

Socket code

IO

Electrical Summary

Heater	6.3 V / 2.5 A
Plate	S1: 250 V / 13 WS2: 250 V / 13 W
Ik max	S1: 125 mAS2: 125 mA
V Inverse	S1: 1,700 V
rP	S1: 280 ΩS2: 280 Ω
gm	S1: 7 mA/VS2: 7 mA/V
μ	S1: 2S2: 2

Sections

2

8 pins - IO - International Octal

Low-mu twin power triode developed primarily as a series-pass regulator in DC power supplies. Two high-current sections with very low amplification factor and plate resistance provide effective control elements for stabilized supply circuits.

Base

6AS

Socket code

UX6

Electrical Summary

Heater	6.3 V / 800 mA
Plate	S1: 325 VS2: 325 V
rP	S1: 24,100 Ω
gm	S1: 2.4 mA/VS2: 2.4 mA/V
μ	S1: 58S2: 58

Sections

2

6 pins - UX6 - Small 6-contact

Direct-coupled twin-triode power amplifier for Class-A audio-frequency output service, using internally related input and output sections to develop bias and deliver power efficiently.

Base

7B

Socket code

MEDIUM7

Electrical Summary

Heater	6.3 V / 600 mA
Plate	S1: 250 VS2: 250 V
rP	S1: 4,300 ΩS2: 4,300 Ω
gm	S1: 1.4 mA/VS2: 1.4 mA/V
μ	S1: 6S2: 6

Sections

2

7 pins - MEDIUM7 - Medium 7-contact transmitting-tube base

Dual low-mu power triode designed for audio output, with its sections usable in push-pull or parallel Class A service. Published operation at 250 V gives about 1.6 W output with both sections.

Base

—

Socket code

—

Electrical Summary

Heater	6.3 V / 2.4 A
Plate	S1: 250 VS2: 250 V

Sections

2

Russian high-current, very low-mu dual power triode intended for series-pass voltage regulation and other high-current control applications.

Base

—

Socket code

IO

Electrical Summary

Heater	6.3 V / 2.5 A
Plate	S1: 250 V / 13 WS2: 250 V / 13 W
Ik max	S1: 130 mAS2: 130 mA
rP	S1: 460 ΩS2: 460 Ω
gm	S1: 5.5 mA/VS2: 5.5 mA/V

Sections

2

IO - International Octal

Low-mu high-current power triode intended for electronic voltage-regulator series-pass service. Its low plate resistance and substantial cathode-current capability make it suited to controlling regulated DC supplies rather than conventional voltage amplification.

Base

—

Socket code

IO

Electrical Summary

Heater	6.3 V / 800 mA
Plate	S2: 300 V
rP	S1: 24,100 Ω

Sections

2

8 pins - IO - International Octal

Direct-coupled dual-triode power-output tube whose internally connected sections form a Class-A amplifier, designed to provide efficient audio power with conventional external circuitry.

Base

8

Socket code

IO

Electrical Summary

Heater	6.3 V / 800 mA
Plate	S1: 325 VS2: 325 V
rP	S1: 24,100 ΩS2: 24,100 Ω
gm	S1: 2.4 mA/VS2: 2.4 mA/V
μ	S1: 58S2: 58

Sections

2

8 pins - IO - International Octal

Direct-coupled dual-triode power amplifier for Class-A and push-pull output service; structurally a dual triode rather than a triode-pentode.

Base

—

Socket code

B9A

Electrical Summary

Heater	6.3 V / 750 mA
Plate	S1: 300 V / 4.8 WS2: 300 V / 4.8 W
rP	S1: 1,800 ΩS2: 1,800 Ω
gm	S1: 9.5 mA/VS2: 9.5 mA/V
μ	S1: 20S2: 20

Sections

2

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

Russian low-mu, high-transconductance double triode designed for low-frequency power amplification, offering relatively high current capability and substantial plate dissipation per section.

Base

—

Socket code

B9A

Electrical Summary

Heater	6.3 V / 750 mA
Plate	S1: 300 V / 4 WS2: 300 V / 4 W
gm	S1: 9.5 mA/VS2: 9.5 mA/V
μ	S1: 20S2: 20

Sections

2

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

Pulse version of the Russian 6N6P double triode, designed for low-frequency power amplification under pulsed operating conditions.

Base

RMA 8B

Socket code

IO

Electrical Summary

Heater	6.3 V / 800 mA
Plate	S1: 330 V / 6.05 WS2: 330 V / 6.05 W
Ik max	S1: 125 mAS2: 125 mA
rP	S1: 11,000 ΩS2: 11,000 Ω
gm	S1: 3.2 mA/VS2: 3.2 mA/V
μ	S1: 35S2: 35

Sections

2

8 pins - IO - International Octal

Dual power triode intended primarily for Class B audio power-amplifier service. Published push-pull operation produces about 10 W, while the sections may also be paralleled for lower-power Class A use.

Base

8B

Socket code

IO

Electrical Summary

Heater	6.3 V / 800 mA
Plate	S1: 300 V / 10 WS2: 300 V / 10 W
Ik max	S1: 125 mAS2: 125 mA
rP	S1: 11,000 ΩS2: 11,000 Ω
gm	S1: 3.2 mA/VS2: 3.2 mA/V
μ	S1: 35S2: 35

Sections

2

8 pins - IO - International Octal

Dual power triode intended primarily for Class B audio power-amplifier service. Published push-pull operation produces about 10 W, while the sections may also be paralleled for lower-power Class A use.

Base

8B

Socket code

IO

Electrical Summary

Heater	6.3 V / 800 mA
Plate	S1: 300 V / 5.5 WS2: 300 V / 5.5 W
rP	S1: 11,000 ΩS2: 11,000 Ω
gm	S1: 3.2 mA/VS2: 3.2 mA/V
μ	S1: 35S2: 35

Sections

2

8 pins - IO - International Octal

GT-envelope dual triode designed for Class A or Class B amplifier service. Its identical sections can operate together in push-pull audio output, with published Class B conditions providing approximately 10 W.

Base

—

Socket code

IO

Electrical Summary

Heater	6.3 V / 800 mA
Plate	S1: 300 V / 5.5 WS2: 300 V / 5.5 W
rP	S1: 11,000 ΩS2: 11,000 Ω
gm	S1: 3.2 mA/VS2: 3.2 mA/V
μ	S1: 35S2: 35

Sections

2

8 pins - IO - International Octal

Dual power triode designed for push-pull Class B audio service. Two matched sections share one envelope and provide moderate transconductance and plate dissipation, with published operating data showing roughly 10 W output.

Base

—

Socket code

IO

Electrical Summary

Heater	6.3 V / 800 mA
Plate	S1: 300 VS2: 300 V
gm	S1: 3.2 mA/VS2: 3.2 mA/V
μ	S1: 35S2: 35

Sections

2

8 pins - IO - International Octal

Indirectly heated oxide-cathode dual power triode designed for Class-B power amplification, intended to operate its two triode sections as an audio power-output device.

Base

—

Socket code

IO

Electrical Summary

Heater	6.3 V / 810 mA
Plate	S1: 300 V / 5.5 WS2: 300 V / 5.5 W
rP	S1: 11,000 ΩS2: 11,000 Ω
gm	S1: 3.4 mA/VS2: 3.4 mA/V
μ	S1: 35S2: 35

Sections

2

8 pins - IO - International Octal

Soviet dual power triode designed for low-frequency power amplification. Its identical sections provide moderate gain and plate resistance with several watts of dissipation each, making it suitable for push-pull audio output and related amplifier service.