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4BU8
Voltage Dual Pentode Pentode-PentodeCommon cathode
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Base
Refer to variations
Socket code
B9A
Electrical Summary
Heater 4.2 V / 450 mA
Plate S1: 300 V / 1.1 WS2: 300 V / 1.1 W
Screen S1: 150 V / 0.75 WS2: 150 V / 0.75 W
Ik max S1: 12 mAS2: 12 mA
gm S1: 1.5 mA/VS2: 1.5 mA/V
Sections
2
9 pins - B9A - Small-button Noval 9-contact
Variations:4GS8
Sharp-cutoff twin pentode designed as combined television sync separator, sync clipper, and automatic-gain-control amplifier.
TV Sync AGC
Source PDFs (8)
4GS8
Voltage Dual Pentode Pentode-PentodeDissimilarSeries-parallel
PDF Google eBay
Base
Refer to variations
Socket code
B9A
Electrical Summary
Heater 4.2 V / 450 mA
Plate S1: 300 V / 1.1 WS2: 300 V / 1.1 W
Screen S1: 150 V / 0.75 WS2: 150 V / 0.75 W
Ik max S1: 12 mAS2: 12 mA
gm S1: 1.2 mA/VS2: 0.27 mA/V
Sections
2
9 pins - B9A - Small-button Noval 9-contact
Variations:4BU8
Sharp-cutoff twin pentode designed as combined television sync separator, sync clipper, and automatic-gain-control amplifier.
TV Sync AGC
Source PDFs (6)

More

Electrical Summary

General Summary

Voltage Dual Pentode Pentode-PentodeCommon cathode

Heater	4.2 V / 450 mA
Plate	S1: 300 V / 1.1 WS2: 300 V / 1.1 W
Screen	S1: 150 V / 0.75 WS2: 150 V / 0.75 W
Ik max	S1: 12 mAS2: 12 mA
gm	S1: 1.5 mA/VS2: 1.5 mA/V

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

Variations:4GS8

Sharp-cutoff twin pentode designed as combined television sync separator, sync clipper, and automatic-gain-control amplifier.

Voltage Dual Pentode Pentode-PentodeDissimilarSeries-parallel

Heater	4.2 V / 450 mA
Plate	S1: 300 V / 1.1 WS2: 300 V / 1.1 W
Screen	S1: 150 V / 0.75 WS2: 150 V / 0.75 W
Ik max	S1: 12 mAS2: 12 mA
gm	S1: 1.2 mA/VS2: 0.27 mA/V

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

Variations:4BU8

Sharp-cutoff twin pentode designed as combined television sync separator, sync clipper, and automatic-gain-control amplifier.

Showing 1-2 of2 tubes