Electronic Tube & Vacuum Tube Catalog

Showing DK91 and all of its variations. Other filters are hidden while viewing variations.

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1R5
Voltage Pentode or Tetrode (under 100V)HeptodeDirectly heated
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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
Variations:DK91
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.
Battery Tube Frequency Converter Tube Mixer Tube Oscillator Tube Radio Detector Converter
Source PDFs (12)
DK91
Voltage Pentode or Tetrode (under 100V)HeptodeDirectly heatedSeries-parallel
PDF Google eBay
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
Variations:1R5
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.
Oscillator Tube Radio Detector Converter Suitable For Battery Equipment
Source PDFs (10)

Electrical Summary

General Summary

1R5

Voltage Pentode or Tetrode (under 100V)HeptodeDirectly heated

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

7 pins - B7G - Miniature 7-contact

Variations:DK91

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.

Battery Tube Frequency Converter Tube Mixer Tube Oscillator Tube Radio Detector Converter

DK91

Voltage Pentode or Tetrode (under 100V)HeptodeDirectly heatedSeries-parallel

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

7 pins - B7G - Miniature 7-contact

Variations:1R5

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.

Oscillator Tube Radio Detector Converter Suitable For Battery Equipment

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