Voltage Pentode or Tetrode (under 100V) vacuum tubes

Pentode

Low-voltage remote-cutoff pentode for automobile-radio RF/IF amplification, designed to operate its heater, plate, and screen directly from a 12 V battery.

Base

7BK

Socket

B7G

Heater

12.6 V

Sections

1

Heptode

Miniature heptode frequency changer developed specifically for automobile radios operating directly from a 12 V battery. It performs oscillator and mixer functions effectively without a conventional high-voltage B-plus supply.

Base

7CH

Socket

B7G

Heater

12.6 V

Sections

1

Pentode

Remote-cutoff miniature pentode for automobile-radio RF/IF amplification, designed for direct plate and screen operation from a 12 V storage battery.

Base

7BK

Socket

B7G

Heater

12.6 V

Sections

1

Heptode

Low-voltage heptode converter for automobile-radio frequency-changing service. It performs oscillator and mixer functions directly from the vehicle's approximately 12.6 V supply without conventional high-voltage B-plus.

Base

7CH

Socket

B7G

Heater

12.6 V

Sections

1

Tetrode-Triode

Medium-mu triode plus space-charge-grid tetrode for low-voltage detector/voltage-amplifier and power-amplifier service; tetrode output is only about 40 mW.

Base

9GS

Socket

B9A

Heater

12.6 V

Sections

2

Pentode

Low-voltage remote-cutoff pentode for automobile-radio RF/IF amplification with heater, plate, and screen supplies obtained directly from the vehicle battery.

Base

Not recorded

Socket

B7G

Heater

12.6 V

Sections

1

Pentode

Sylvania pentode documented in manufacturer literature. The available source does not provide sufficiently readable application or cutoff detail beyond its placement in the sharp-cutoff population, so classification remains conservative.

Base

Not recorded

Socket

B7G

Heater

12.6 V

Sections

1

Diode-Pentode

Low-voltage diode-pentode for automobile-radio RF or IF amplification and detection. Both sections operate effectively from the vehicle's approximately 12.6 V supply without conventional high-voltage B-plus.

Base

Not recorded

Socket

B9A

Heater

12.6 V

Sections

2

Pentode

Remote-cutoff miniature pentode for automobile-receiver IF and RF amplification, optimized for low plate voltage and automatic-volume-control operation.

Base

Not recorded

Socket

B9A

Heater

12.6 V

Sections

1

Diode-Diode-Tetrode

Low-voltage automobile-radio combination tube with two detector/AVC diodes and a tetrode amplifier designed to operate directly from a nominal 12.6 V vehicle supply.

Base

Not recorded

Socket

Not recorded

Heater

12.6 V

Sections

3

Diode-Diode-Tetrode

Two-diode space-charge-grid tetrode developed as an automobile-radio audio driver, operating directly from 12.6 V and providing useful drive power at exceptionally low plate voltage.

Base

Not recorded

Socket

B9A

Heater

12.6 V

Sections

3

Diode-Diode-Tetrode

Hybrid automobile-radio tube combining two detector diodes with a high-perveance space-charge tetrode designed to drive a transistorized audio-output stage directly from 12.6 V.

Base

9JU

Socket

B9A

Heater

12.6 V

Sections

3

Diode-Diode-Tetrode

Improved automobile-radio diode-tetrode combining two detector diodes with a high-transconductance space-charge-grid audio driver for transistorized output stages operating from a 12.6 V supply.

Base

Not recorded

Socket

B9A

Heater

12.6 V

Sections

3

Diode-Diode-Tetrode

Low-voltage automobile-radio diode-tetrode whose space-charge-grid section operates directly from the 12.6 V vehicle supply as an audio driver, with two diodes for detection.

Base

Not recorded

Socket

B9A

Heater

12.6 V

Sections

3

Diode-Diode-Tetrode

Two-diode space-charge-grid tetrode for low-voltage automobile-radio service, providing useful amplification directly from approximately 12.6 V while integrating detector or control rectification.

Base

9HR

Socket

B9A

Heater

12.6 V

Sections

3

Tetrode-Triode

Sharp-cutoff triode-tetrode combination in nine-pin miniature construction for signal and control applications.

Base

Not recorded

Socket

B9A

Heater

12.6 V

Sections

2

Pentode

Low-voltage remote-cutoff pentode for automobile and other 12 V RF/IF amplifier applications with direct battery-supply operation.

Base

7BK

Socket

B7G

Heater

12.6 V

Sections

1

Pentode

Remote-cutoff miniature pentode for low-voltage RF/IF amplification in hybrid automobile radios using direct 12 V electrical-system supplies.

Base

7BK

Socket

B7G

Heater

12.6 V

Sections

1

Pentode-Triode

Medium-mu triode and sharp-cutoff pentode combination for signal amplification and general electronic service.

Base

9FA

Socket

B9A

Heater

12.6 V

Sections

2

Pentode

Seven-pin miniature sharp-cutoff pentode documented for fixed-gain signal-amplifier service. Manufacturer sources provide its electrical ratings and operating characteristics without indicating a stronger specialized functional identity.

Base

Not recorded

Socket

B7G

Heater

12.6 V

Sections

1

Diode-Diode-Pentode

Low-voltage combination of two detector diodes and a remote-cutoff pentode for 12 V automobile receivers. The pentode provides controlled-gain amplification while the common-cathode diodes perform detector or AVC rectification.

Base

9FH

Socket

B9A

Heater

12.6 V

Sections

3

Heptode

Pentagrid oscillator-converter designed specifically for 12 V automobile superheterodyne receivers. It combines local-oscillator and mixer functions while operating directly from the vehicle electrical supply.

Base

7CH

Socket

B7G

Heater

12.6 V

Sections

1

Diode-Pentode-Triode

Pentode-triode-diode for automobile receivers, providing IF amplification, audio-frequency amplification, and second-detector service directly from a 12-volt battery.

Base

9KU

Socket

B9A

Heater

12.6 V

Sections

3

Heptode

Low-voltage heptode oscillator-converter for 12 V automobile radios. It combines mixer and local-oscillator functions while operating directly from the vehicle supply without conventional high-voltage B-plus.

Base

7CH

Socket

B7G

Heater

12.6 V

Sections

1

Diode-Diode-Tetrode

Low-voltage double-diode tetrode developed for automobile receivers, combining detector functions with a tetrode amplifier optimized for direct operation from a 12 V battery supply.

Base

9BG

Socket

B9A

Heater

12.6 V

Sections

3

Tetrode

Space-charge-grid tetrode power-amplifier driver designed for direct operation from an automotive battery, providing useful low-voltage power gain without a conventional high-voltage plate supply.

Base

Not recorded

Socket

B7G

Heater

12.6 V

Sections

1

Heptode

Battery or receiving-tube frequency converter combining local-oscillator and mixer action for superheterodyne radio service. Its multi-grid structure provides frequency conversion while minimizing component count and, in battery types, filament power.

Base

7DH

Socket

B7G

Heater

1.4 V

Sections

1

Heptode

Battery or receiving-tube frequency converter combining local-oscillator and mixer action for superheterodyne radio service. Its multi-grid structure provides frequency conversion while minimizing component count and, in battery types, filament power.

Base

7DH

Socket

B7G

Heater

1.4 V

Sections

1

Pentode

Directly heated subminiature sharp-cutoff pentode for AF and RF voltage amplification in compact battery-powered equipment.

Base

1AD4

Socket

SUBMINIATURE7

Heater

1.25 V

Sections

1

Pentode

Directly heated sharp-cutoff RF pentode for economical battery-operated receiver amplification with a 1.25 V, 40 mA filament.

Base

8CP

Socket

IO

Heater

1.25 V

Sections

1

Heptode

Battery or receiving-tube frequency converter combining local-oscillator and mixer action for superheterodyne radio service. Its multi-grid structure provides frequency conversion while minimizing component count and, in battery types, filament power.

Base

1AE5

Socket

B7G

Heater

1.25 V

Sections

1

Diode-Pentode

Directly heated battery diode-pentode combining radio signal detection with subsequent low-frequency voltage amplification. The diode recovers the received signal while the pentode provides AF gain in economical portable receivers.

Base

Not recorded

Socket

B7G

Heater

1.4 V

Sections

2

Diode-Pentode

Directly heated battery diode-pentode combining radio signal detection with subsequent low-frequency voltage amplification. The diode recovers the received signal while the pentode provides AF gain in economical portable receivers.

Base

Not recorded

Socket

Not recorded

Heater

1.4 V

Sections

2

Diode-Pentode

Directly heated battery diode-pentode combining radio signal detection with subsequent low-frequency voltage amplification. The diode recovers the received signal while the pentode provides AF gain in economical portable receivers.

Base

6B

Socket

B7G

Heater

1.25 V

Sections

2

Pentode

Fully shielded subminiature directly heated RF pentode designed for low-drain battery equipment. Its compact construction and economical filament requirements suit portable high-frequency signal-amplifier applications where power consumption and space are restricted.

Base

1AD4

Socket

B7G

Heater

1.25 V

Sections

1

Diode-Pentode

Directly heated battery diode-pentode combining radio signal detection with subsequent low-frequency voltage amplification. The diode recovers the received signal while the pentode provides AF gain in economical portable receivers.

Base

TDJ

Socket

Not recorded

Heater

1.4 V

Sections

2

Pentode

Directly heated remote-cutoff RF pentode with a 1.4 V, 25 mA filament. Designed for Class A high-frequency amplification, it combines low filament drain with variable-gain capability for portable battery receivers.

Base

6AR

Socket

B7G

Heater

1.4 V

Sections

1

Diode-Pentode

Directly heated diode and sharp-cutoff pentode combination designed for low-voltage Class-A amplifier service in battery-operated equipment.

Base

1AJ5

Socket

Not recorded

Heater

1.25 V

Sections

2

Pentode

Directly heated sharp-cutoff RF pentode for low-drain Class-A high-frequency amplification in portable equipment.

Base

1AK4

Socket

Not recorded

Heater

1.25 V

Sections

1

Diode-Pentode

Directly heated diode and sharp-cutoff pentode combination designed for low-voltage Class-A amplifier service in battery-operated equipment.

Base

1AJ5

Socket

Not recorded

Heater

1.25 V

Sections

2

Heptode

Battery or receiving-tube frequency converter combining local-oscillator and mixer action for superheterodyne radio service. Its multi-grid structure provides frequency conversion while minimizing component count and, in battery types, filament power.

Base

8CN

Socket

B8G

Heater

1.25 V

Sections

1

Diode-Pentode

Battery diode-pentode combining radio detection with remote-cutoff amplification. The diode provides signal or AVC rectification while the controlled-cutoff pentode supports gain-controlled receiver amplification in portable equipment.

Base

6BW

Socket

B7G

Heater

1.4 V

Sections

2

Heptode

Very-low-power directly heated pentagrid converter for portable superheterodyne receivers. It combines oscillator and mixer functions while drawing only about 40 mA from a 1.25 V filament.

Base

8CN

Socket

B8G

Heater

1.25 V

Sections

1

Pentode

Directly heated variable-mu pentode designed for RF and IF amplification. Its controlled transfer characteristic supports gain-regulated receiver stages while the filamentary cathode suits low-power equipment.

Base

Not recorded

Socket

B7G

Heater

1.4 V

Sections

1

Pentode

Directly heated variable-mu pentode intended for RF and IF amplification. The variable-mu characteristic permits controlled receiver gain, while its filamentary construction supports compact low-power signal equipment.

Base

Not recorded

Socket

B7G

Heater

1.2 V

Sections

1

Heptode

Extremely low-consumption directly heated pentagrid mixer-oscillator for battery-powered radios. Its very low filament current minimizes battery drain while the multi-grid structure performs local oscillation and frequency conversion.

Base

Not recorded

Socket

B7G

Heater

1.4 V

Sections

1

Heptode

Low-power directly heated heptode frequency changer for portable battery receivers. Its economical filament supports oscillator-mixer service from modest plate and screen supplies in compact superheterodyne radios.

Base

Not recorded

Socket

B7G

Heater

1.2 V

Sections

1

Heptode

Directly heated variable-mu heptode for mixer service in battery-operated radio equipment. Its controlled characteristic permits gain variation during frequency conversion while maintaining modest filament demand.

Base

Not recorded

Socket

B7G

Heater

1.6 V

Sections

1