6DB6

Dual-control sharp-cutoff pentode for color-television demodulation, gating, and controlled-amplifier circuits. Two effective control grids enable switching and signal processing beyond ordinary pentode amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7CM
Socket code: B7G
Base pins: 7
Nominal heater: 6.3 V / 300 mA

Description

The Westinghouse 6DB6 is a dual-control sharp-cutoff pentode for color demodulation and gating.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7CM
Socket code: B7G
Base pins: 7
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7CM - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1G1	A	G1 — Control Grid EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN2K	A	K — Cathode EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN3H	—	H — Heater EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN4H	—	H — Heater EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN5P	A	P — Plate (Anode) EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN6G2	A	G2 — Screen Grid EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN7G3	A	G3 — Suppressor GridGroup 7CM7 EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN7IS	A	IS — Internal ScreenGroup 7CM7 EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 50000 Ω
Transconductance: 0.00205 S
Max plate voltage: 300 V
Max screen voltage: 150 V
Max plate dissipation: 3 W

Dual-control pentode for gated or controlled Class-A amplifier service.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
150 V
ClassA; Grid3Bias-3V
Screen voltage
150 V
ClassA; Grid3Bias-3V
Control-grid bias magnitude
1 V
ClassA; Grid3Bias-3V
Plate current
5.8 mA
ClassA; Grid3Bias-3V
Screen current
6.6 mA
ClassA; Grid3Bias-3V
Plate resistance
50000 ohm
ClassA; Grid3Bias-3V
Transconductance
2050 uS
ClassA; Grid3Bias-3V

Characteristics

Input capacitance
6 pF
Output capacitance
5 pF
Grid-to-plate capacitance
0.0035 pF

Data set 02

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater Voltage
6.3 V
Heater Current
300 mA
Transconductance
2050 uS
RepresentativePublishedPoint
Plate Resistance
50000 ohm
RepresentativePublishedPoint
Plate Voltage
150 V
Screen Voltage
150 V
Grid3 Voltage
-3 V
Grid1 Voltage
-1 V
Grid3-to-Plate Transconductance
1000 uS
Plate Current
5.8 mA
Screen Current
6.6 mA

Other

Maximum Plate Voltage
300 V
Maximum Plate Dissipation
3 W
Screen Supply Voltage
300 V
Screen Dissipation
1 W