Electronic tube and vacuum tube catalog

Base

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Socket code

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Electrical Summary

Heater	28 V / 100 mA
Plate	S1: 250 V / 1 W
Screen	S1: 250 V / 0.5 W
gm	S1: 4 mA/V
μ	S1: 17

Sections

2

Combination triode-pentode developed for receiver frequency-changing and related signal-processing service. The pentode performs mixer/converter work while the separate triode supplies local oscillation in series-heater radio designs.

Base

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Socket code

B7G

Electrical Summary

Heater	12.6 V / 150 mA
Plate	S2: 300 V / 2.5 W
Screen	S2: 300 V / 0.3 W
rP	S2: 800,000 Ω
gm	S2: 2.2 mA/V

Sections

2

7 pins - B7G - Miniature 7-contact

Combination diode-pentode for receiving-equipment detection and signal amplification. The diode provides detector or rectifying action while the pentode supplies useful voltage gain in series-heater receiver designs.

Base

7FW

Socket code

B7G

Electrical Summary

Heater	12.6 V / 150 mA
Plate	S1: 300 V / 3 W
Screen	S1: 300 V / 0.6 W
Rectifier	S2: 1 mA
rP	S1: 250,000 Ω
gm	S1: 4.3 mA/V

Sections

2

7 pins - B7G - Miniature 7-contact

Remote-cutoff RF/IF pentode combined with a demodulator diode on a common cathode for receiver amplification and detection.

Base

8BU

Socket code

IO

Electrical Summary

Heater	12.6 V / 150 mA
Plate	S2: 180 V
Screen	S2: 180 V
rP	S2: 160,000 Ω
gm	S2: 2.15 mA/V

Sections

2

8 pins - IO - International Octal

Combined detector diode and pentode designed for detector and amplifier service in receiving equipment.

Base

OCTAL

Socket code

IO

Electrical Summary

Heater	12.6 V / 100 mA
Plate	S1: 250 V / 2 W
Screen	S1: 250 V
Ik max	S1: 10 mA
rP	S1: 1,000,000 Ω
gm	S1: 2 mA/V
μ	S1: 18

Sections

2

IO - International Octal

Remote-cutoff RF pentode combined with a diode detector for receiver amplification and demodulation. The pentode provides controlled-gain RF/IF amplification while the diode supplies signal detection.

Base

7AZ

Socket code

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Electrical Summary

Heater	12.6 V / 150 mA
Plate	S1: 300 V
Screen	S1: 150 V
rP	S1: 700,000 Ω
gm	S1: 2.05 mA/V

Sections

2

7 pins

Combination diode-pentode providing signal detection and voltage amplification within one receiving tube. The pentode offers useful gain and isolation while the diode supplies detector or control-voltage rectification.

Base

6AX

Socket code

B8G

Electrical Summary

Heater	1.4 V / 50 mA
Plate	S2: 110 V
Screen	S2: 40 V
rP	S2: 750,000 Ω
gm	S2: 0.875 mA/V

Sections

2

8 pins - B8G - Loctal 8-contact

Battery diode-pentode combining signal detection with relatively high-gain voltage amplification. The diode supplies detector action while the pentode provides subsequent gain from low-voltage portable receiver supplies.

Base

8CO

Socket code

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Electrical Summary

Heater	1.25 V / 40 mA
Plate	S2: 100 V
Screen	S2: 100 V
Ik max	S2: 2 mA
rP	S2: 400,000 Ω
gm	S2: 0.6 mA/V

Sections

2

8 pins

Very-low-power battery diode-pentode combining signal detection with voltage amplification. The diode recovers the received signal while the pentode provides subsequent gain from an exceptionally economical directly heated filament.

Base

8DA

Socket code

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Electrical Summary

Heater	1.25 V / 40 mA
Plate	S2: 100 V
Screen	S2: 100 V
Ik max	S2: 2 mA
rP	S2: 400,000 Ω
gm	S2: 0.6 mA/V

Sections

2

8 pins

Very-low-power battery diode-pentode for detector and amplifier service. The diode provides signal detection while the pentode supplies subsequent voltage amplification from an exceptionally economical directly heated filament.

Base

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Socket code

B9A

Electrical Summary

Heater	6.3 V / 600 mA
Plate	S1: 300 V / 3 WS2: 250 V
rP	S1: 500,000 Ω
gm	S1: 5.2 mA/V

Sections

2

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

Television diode-pentode combining an RF amplifier with a limiter or detector diode. Manufacturer application centers on television receiver signal processing rather than general radio detector/converter service.

Base

7EA

Socket code

B7G

Electrical Summary

Heater	6.3 V / 300 mA
Plate	S2: 300 V / 2.5 W
Screen	S2: 150 V / 0.3 W
Ik max	S1: 2 mA
rP	S2: 200,000 Ω
gm	S2: 1.95 mA/V

Sections

2

9 pins - B7G - Miniature 7-contact

Detector diode combined with a remote-cutoff pentode for audio amplification with AVC control, improving receiver automatic-volume-control performance.

Base

OCTAL

Socket code

IO

Electrical Summary

Heater	6.3 V / 300 mA
Plate	S1: 300 V / 2 WS2: 200 V
Screen	S1: 300 V / 0.3 W
Ik max	S1: 10 mA
Rectifier	S2: 0.8 mA
rP	S1: 1,400,000 Ω
gm	S1: 2 mA/V
μ	S1: 18

Sections

2

8 pins - IO - International Octal

Single detector diode combined with a remote-cutoff RF pentode for receiver radio-frequency amplification and detection.

Base

9LQ

Socket code

B9A

Electrical Summary

Heater	6.3 V / 450 mA
Plate	S2: 300 V / 2.5 W
Screen	S2: 150 V / 0.5 W
Ik max	S1: 1 mA
rP	S2: 500,000 Ω
gm	S2: 2.2 mA/V

Sections

2

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

Diode-pentode combination integrating signal rectification with voltage amplification. The pentode supplies useful receiver gain while the diode provides a complementary detector or control-voltage function.

Base

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Socket code

IO

Electrical Summary

Heater	6.3 V / 300 mA
Plate	S2: 250 V
Screen	S2: 100 V
rP	S2: 800,000 Ω
gm	S2: 1 mA/V

Sections

2

8 pins - IO - International Octal

Diode variable-mu pentode for detector and gain-controlled receiver amplification. The pentode supports automatic gain regulation while the associated diode supplies complementary detector or control-voltage rectification.

Base

7AZ

Socket code

IO

Electrical Summary

Heater	6.3 V / 300 mA
Plate	S2: 300 V / 2.5 W
Screen	S2: 100 V / 0.5 W
V Inverse	S1: 330 V
rP	S2: 700,000 Ω
gm	S2: 2.05 mA/V

Sections

2

8 pins - IO - International Octal

Diode-pentode combination for detector and voltage-amplifier service. The pentode provides useful gain and high output resistance while the diode supplies complementary detector or control-voltage rectification.

Base

—

Socket code

IO

Electrical Summary

Plate	S1: 250 V
Screen	S1: 100 V
gm	S1: 2.05 mA/V

Sections

2

IO - International Octal

GT-envelope diode-pentode for combined signal detection and voltage amplification. The pentode supplies receiver gain while the diode provides a complementary detector or rectifying function.

Base

7AZ

Socket code

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Electrical Summary

Heater	6.3 V / 300 mA
Plate	S2: 300 V / 2.3 W
Screen	S2: 150 V / 0.6 W
rP	S2: 700,000 Ω
gm	S2: 2.6 mA/V

Sections

2

8 pins

Diode plus sharp-cutoff RF pentode designed for AM detection, voltage amplification, and FM limiting below about 30 MHz. Its radio detector role is integral despite the sharp-cutoff amplifier section.

Base

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Socket code

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Electrical Summary

Heater	1.2 V / 50 mA
Plate	S2: 150 V
Screen	S2: 150 V
rP	S2: 900,000 Ω
gm	S2: 0.6 mA/V

Sections

2

Directly heated battery diode-pentode combining detector and AGC rectification with audio-frequency voltage amplification. Its economical 1.2 V, 50 mA filament and high-resistance pentode make it well suited to portable radio receivers.

Base

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Socket code

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Electrical Summary

Heater	1.4 V / 25 mA
Plate	S1: 135 V / 0.2 W
Screen	S1: 85 V / 0.02 W
Rectifier	S2: 200 mA
V Inverse	S2: 100 V
rP	S1: 2,200,000 Ω
gm	S1: 0.7 mA/V

Sections

2

Directly heated battery diode-pentode for RF or IF amplification together with signal detection. Its exceptionally economical 1.4 V, 25 mA filament and high-resistance pentode make it particularly suitable for portable receivers.

Base

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Socket code

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Electrical Summary

Heater	1.4 V / 50 mA
Plate	S1: 135 V / 0.1 W
Screen	S1: 85 V / 0.02 W
Rectifier	S2: 200 mA
V Inverse	S2: 100 V
rP	S1: 2,200,000 Ω
gm	S1: 0.7 mA/V

Sections

2

Directly heated battery diode-pentode combining a detector diode with a high-resistance pentode for resistance-coupled audio voltage amplification. Its 1.4 V, 50 mA filament suits low-consumption portable receivers.

Base

B7G

Socket code

B7G

Electrical Summary

Heater	1.4 V / 25 mA
Plate	S2: 120 V / 0.03 W
Screen	S2: 90 V / 0.01 W
Ik max	S1: 0.2 mAS2: 0.25 mA
Rectifier	S1: 200 mA
V Inverse	S1: 100 V
rP	S2: 1,000,000 Ω
gm	S2: 0.7 mA/V
μ	S2: 16

Sections

2

7 pins - B7G - Miniature 7-contact

Low-consumption directly heated diode-pentode for detection and audio-frequency voltage amplification in battery receivers. Its 1.4 V, 25 mA filament makes it especially economical for portable equipment where battery life is important.

Base

RIMLOCK

Socket code

RIMLOCK8

Electrical Summary

Heater	6.3 V / 200 mA
Plate	S1: 300 V / 2 W
Screen	S1: 300 V / 0.3 W
Ik max	S1: 10 mA
Rectifier	S2: 600 mA
V Inverse	S2: 350 V
rP	S1: 1,200,000 Ω
gm	S1: 1.8 mA/V
μ	S1: 19

Sections

2

8 pins - RIMLOCK8 - Rimlock 8-contact base

Diode-pentode for receiver RF/IF amplification and detection. The high-resistance pentode provides useful high-frequency gain while the separate diode supplies signal-detection and rectification service.

Base

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Socket code

B9A

Electrical Summary

Heater	6.3 V / 300 mA

Sections

2

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

Telefunken diode-pentode for receiver detection and controlled RF/IF amplification. Its remote-cutoff pentode permits progressive gain control while the separate diode provides detector or control-voltage rectification.

Base

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Socket code

P8A

Electrical Summary

Heater	6.3 V / 200 mA
Plate	S1: 300 VS2: 300 V / 1.5 W
Screen	S2: 300 V / 0.3 W
Ik max	S2: 10 mA
Rectifier	S1: 0.8 mA
V Inverse	S1: 200 V
rP	S2: 500,000 Ω
gm	S2: 1.8 mA/V
μ	S2: 19

Sections

2

8 pins - P8A - European 8-pin side-contact base

Diode-pentode for receiver signal detection and voltage amplification. The high-resistance pentode supplies small-signal gain while the separate diode provides detector or control-voltage rectification.

Base

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Socket code

SIDE8

Electrical Summary

Heater	6.3 V / 200 mA
Plate	S2: 300 V / 1.5 W
Screen	S2: 300 V / 0.3 W
Ik max	S2: 10 mA
Rectifier	S1: 0.8 mA
V Inverse	S1: 350 V
rP	S2: 1,300,000 Ω
gm	S2: 1.8 mA/V
μ	S2: 19

Sections

2

8 pins - SIDE8 - European side-contact 8-contact base

Diode-pentode receiving valve combining signal detection with high-resistance pentode amplification. The pentode supplies receiver gain while the separate diode provides detector or control-voltage rectification.

Base

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Socket code

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Electrical Summary

Heater	4 V / 180 mA
Plate	S2: 200 V
Screen	S2: 100 V

Sections

2

Telefunken screen-grid binode combining a detector diode with an amplifier pentode for detection followed by audio-frequency amplification. Integrating both functions reduces receiver tube count in series-heater equipment.

Base

—

Socket code

RIMLOCK8

Electrical Summary

Heater	12.6 V / 100 mA
Plate	S1: 250 V / 2 WS2: 350 V
Screen	S1: 250 V / 0.3 W
Ik max	S1: 10 mAS2: 0.8 mA
rP	S1: 900,000 Ω
gm	S1: 1.8 mA/V

Sections

2

8 pins - RIMLOCK8 - Rimlock 8-contact base

Series-heater diode variable-mu pentode for RF/IF amplification and signal detection. The pentode provides controlled gain for automatic gain control while the diode handles detector or control rectification.

Base

Refer to variations

Socket code

B8A

Electrical Summary

Heater	12.6 V / 100 mA
Plate	S1: 200 VS2: 170 V / 2 W
Screen	S2: 85 V / 0.3 W
Ik max	S1: 0.8 mAS2: 10 mA
V Inverse	S1: 350 V
rP	S2: 900,000 Ω
gm	S2: 2 mA/V

Sections

2

8 pins - B8A - Rimlock 8-contact

Series-heater diode variable-mu pentode combining receiver detection with controlled RF, IF, or audio amplification. The pentode provides broad gain control while the diode supplies independent detection.