Electronic tube and vacuum tube catalog

Base

7CH

Socket code

B7G

Electrical Summary

Heater	12.6 V / 150 mA
Plate	30 V
Screen	30 V
Ik max	20 mA
rP	1,000,000 Ω
μ	9.4

Sections

1

7 pins - B7G - Miniature 7-contact

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 code

B7G

Electrical Summary

Heater	12.6 V / 150 mA
Plate	16 V
Screen	16 V
Ik max	4.2 mA
gm	0.3 mA/V

Sections

1

7 pins - B7G - Miniature 7-contact

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 code

B7G

Electrical Summary

Heater	12.6 V / 150 mA
Plate	30 V
Screen	30 V
Ik max	20 mA
rP	800,000 Ω

Sections

1

7 pins - B7G - Miniature 7-contact

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 code

B7G

Electrical Summary

Heater	12.6 V / 150 mA
Plate	16 V
Screen	16 V
rP	1,000,000 Ω
gm	0.14 mA/V
μ	2

Sections

1

7 pins - B7G - Miniature 7-contact

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

7DH

Socket code

B7G

Electrical Summary

Heater	1.4 V / 25 mA
Plate	90 V / 0.15 W
Screen	90 V / 0.03 W
Ik max	2.6 mA
rP	900,000 Ω
gm	0.275 mA/V

Sections

1

7 pins - B7G - Miniature 7-contact

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 code

B7G

Electrical Summary

Heater	1.4 V / 50 mA
Plate	90 V / 0.15 W
Screen	90 V
Ik max	4 mA
rP	900,000 Ω
gm	0.3 mA/V

Sections

1

7 pins - B7G - Miniature 7-contact

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 code

B7G

Electrical Summary

Heater	1.25 V / 60 mA
Plate	45 V
Screen	45 V
rP	200,000 Ω
gm	0.2 mA/V

Sections

1

7 pins - B7G - Miniature 7-contact

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 code

B8G

Electrical Summary

Heater	1.25 V / 40 mA
Plate	67.5 V
Screen	45 V
rP	400,000 Ω

Sections

1

8 pins - B8G - Loctal 8-contact

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 code

B8G

Electrical Summary

Heater	1.25 V / 40 mA
Plate	67.5 V
Screen	45 V
rP	400,000 Ω
gm	0.15 mA/V

Sections

1

8 pins - B8G - Loctal 8-contact

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

—

Socket code

B7G

Electrical Summary

Heater	1.4 V / 25 mA
Plate	90 V / 0.15 W
Screen	67.5 V
Ik max	5.5 mA
gm	0.3 mA/V

Sections

1

7 pins - B7G - Miniature 7-contact

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

—

Socket code

B7G

Electrical Summary

Heater	1.2 V / 30 mA
Plate	90 V / 0.15 W
Screen	67.5 V / 0.25 W
Ik max	5.5 mA
gm	0.3 mA/V

Sections

1

7 pins - B7G - Miniature 7-contact

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

—

Socket code

B7G

Electrical Summary

Heater	1.6 V / 50 mA
Plate	90 V / 0.15 W
Screen	67.5 V
Ik max	3 mA
gm	0.16 mA/V

Sections

1

7 pins - B7G - Miniature 7-contact

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

7AK

Socket code

B8G

Electrical Summary

Heater	1.4 V / 50 mA
Plate	90 V
Screen	65 V
Ik max	3 mA
rP	700,000 Ω
gm	0.25 mA/V

Sections

1

8 pins - B8G - Loctal 8-contact

Low-consumption battery heptode for oscillator-converter service in portable superheterodyne radios. Its economical filament and high plate resistance provide useful frequency conversion from modest receiver supply voltages.

Base

8AX

Socket code

B8G

Electrical Summary

Heater	1.4 V / 50 mA
Plate	90 V
Screen	67.5 V
rP	2,000,000 Ω
gm	0.1 mA/V

Sections

1

8 pins - B8G - Loctal 8-contact

Battery heptode converter with exceptionally high plate resistance for oscillator and mixer service in portable superheterodyne receivers. Very low filament consumption emphasizes battery economy over maximum conversion gain.

Base

7AK

Socket code

B8G

Electrical Summary

Heater	1.4 V / 50 mA
Plate	90 V
Screen	35 V
Ik max	3 mA
rP	650,000 Ω
gm	0.25 mA/V

Sections

1

8 pins - B8G - Loctal 8-contact

Battery pentagrid converter for oscillator and mixer service in portable superheterodyne receivers. Its economical filament and modest supply requirements provide useful frequency-changing performance with low battery consumption.

Base

7AT

Socket code

B7G

Electrical Summary

Heater	1.4 V / 50 mA
Plate	90 V
Screen	90 V
Ik max	5.5 mA
rP	400,000 Ω
gm	0.28 mA/V
μ	6.5

Sections

1

7 pins - B7G - Miniature 7-contact

Widely used battery pentagrid converter for portable superheterodyne receivers. It combines local oscillator and mixer functions while its economical filament and modest supply requirements suit compact battery radios.

Base

—

Socket code

—

Electrical Summary

Heater	1.4 V / 50 mA
Plate	90 V
Screen	67.5 V
Ik max	5.5 mA
rP	600,000 Ω
gm	0.3 mA/V

Sections

1

Low-consumption battery heptode for oscillator and frequency-converter service in portable superheterodyne receivers. Its economical directly heated filament minimizes battery drain while providing useful conversion performance.

Base

—

Socket code

—

Electrical Summary

Heater	1.4 V / 50 mA
Plate	90 V / 0.2 W
Screen	67.5 V / 0.25 W
Ik max	6 mA
gm	0.26 mA/V

Sections

1

Low-consumption battery heptode frequency converter for portable superheterodyne receivers, using a 1.4 V filament for economical oscillator-mixer operation.

Base

—

Socket code

IO

Electrical Summary

Heater	1.4 V / 50 mA
Plate	90 V
Screen	45 V
Ik max	2.5 mA
rP	600,000 Ω

Sections

1

8 pins - IO - International Octal

Directly heated battery heptode designed as the oscillator-mixer frequency changer in portable superheterodyne receivers. Its low filament consumption and modest electrode currents reflect economical battery-powered radio service.

Base

B7G

Socket code

B7G

Electrical Summary

Heater	1.4 V / 50 mA
Plate	90 V / 0.15 W
Screen	67.5 V / 0.25 W
Ik max	5.5 mA
rP	800,000 Ω
gm	1.4 mA/V

Sections

1

7 pins - B7G - Miniature 7-contact

Directly heated battery heptode for oscillator-mixer frequency conversion in portable superheterodyne receivers. Its 1.4 V, 50 mA filament provides useful receiver conversion performance with very low filament power consumption.

Base

B7G

Socket code

B7G

Electrical Summary

Heater	1.4 V / 25 mA
Plate	90 V / 0.15 W
Screen	60 V / 0.1 W
Ik max	2.6 mA
rP	800,000 Ω
gm	0.3 mA/V
μ	7.5

Sections

1

7 pins - B7G - Miniature 7-contact

Very low-consumption battery heptode for oscillator-mixer frequency conversion in portable radios. Its 1.4 V, 25 mA filament is specifically suited to receivers where extending battery life is important.

Base

—

Socket code

—

Electrical Summary

Heater	1.2 V / 60 mA
Plate	90 V / 0.2 W
Screen	67.5 V / 0.25 W
Ik max	6 mA
gm	0.29 mA/V

Sections

1

Battery heptode frequency converter for portable radio receivers, combining oscillator and mixer action with a directly heated 1.2 V low-current filament.

Base

—

Socket code

—

Electrical Summary

Heater	1.4 V / 50 mA
Plate	90 V
Screen	90 V
gm	0.25 mA/V

Sections

1

Radio receiver frequency changer combining oscillator and mixer functions for superheterodyne conversion. Its multi-grid construction translates incoming RF signals to the intermediate frequency within the receiver front end.

Base

—

Socket code

B7G

Electrical Summary

Heater	1.4 V
Plate	90 V
Screen	67.5 V

Sections

1

B7G - Miniature 7-contact

Radio receiver frequency changer designed for superheterodyne mixer and oscillator service. Its multi-grid construction performs signal conversion, often integrating local oscillation and mixing within one valve.