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Showing 3A4 and all of its variations. Other filters are hidden while viewing variations.

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3A4
Power - Pentode Single (NOT beam) (under 10W)PentodeDirectly heatedSeries-parallel
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Base
7B8
Socket code
B7G
Sections
1
Heater
1.4 V / 200 mA
Plate
150 V / 2 W
Screen
135 V / 0.9 W
Ik max
25 mA
rP
90,000 Ω
gm
1.9 mA/V
μ
190
7 pins - B7G - Miniature 7-contact
Variations:DL93
Directly heated power pentode for oscillator, Class-A audio, or Class-C RF power service. Series/parallel filament operation supports portable equipment, with documented output around one watt under suitable conditions.
Oscillator Tube Power Pentode RF Power Tube Suitable For Battery Equipment
Source PDFs (11)
DL93
Power - Pentode Single (NOT beam) (under 10W)PentodeDirectly heatedSeries-parallel
PDF Google eBay
Base
Miniature
Socket code
B7G
Sections
1
Heater
1.4 V / 200 mA
Plate
150 V / 2 W
Screen
150 V / 0.4 W
Ik max
25 mA
rP
100,000 Ω
gm
1.9 mA/V
7 pins - B7G - Miniature 7-contact
Variations:3A4
Centre-tapped-filament battery output pentode. Designed for portable audio power amplification, its filament arrangement provides supply flexibility in battery-operated receivers.
Named For Audio Output Power Pentode Suitable For Battery Equipment
Source PDFs (6)

Electrical Summary

General Summary

3A4

Power - Pentode Single (NOT beam) (under 10W)PentodeDirectly heatedSeries-parallel

Heater	1.4 V / 200 mA
Plate	150 V / 2 W
Screen	135 V / 0.9 W
Ik max	25 mA
rP	90,000 Ω
gm	1.9 mA/V
μ	190

7 pins - B7G - Miniature 7-contact

Variations:DL93

Directly heated power pentode for oscillator, Class-A audio, or Class-C RF power service. Series/parallel filament operation supports portable equipment, with documented output around one watt under suitable conditions.

Oscillator Tube Power Pentode RF Power Tube Suitable For Battery Equipment

DL93

Power - Pentode Single (NOT beam) (under 10W)PentodeDirectly heatedSeries-parallel

Heater	1.4 V / 200 mA
Plate	150 V / 2 W
Screen	150 V / 0.4 W
Ik max	25 mA
rP	100,000 Ω
gm	1.9 mA/V

7 pins - B7G - Miniature 7-contact

Variations:3A4

Centre-tapped-filament battery output pentode. Designed for portable audio power amplification, its filament arrangement provides supply flexibility in battery-operated receivers.

Named For Audio Output Power Pentode Suitable For Battery Equipment

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