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Power - TV Vertical Output ·Triode-Triode

6GF7A

Dual triode intended for television vertical-deflection service, combining oscillator/driver and power-output functions where applicable. Manufacturer data emphasize vertical-sweep operation, pulse-voltage capability, and the stronger section’s current and dissipation requirements.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9QD
Socket code: B9E
Base pins: 9
Nominal heater: 6.3 V / 985 mA

Description

Dissimilar dual triode for television vertical oscillator and vertical-deflection amplifier service.

Socket description

Novar 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 9QD
Socket code: B9E
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 985 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9QD - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 40000 Ω
Transconductance: 0.0016 S
Amplification factor: 64
Max plate voltage: 330 V
Max plate dissipation: 1.5 W
Max cathode current: 22 mA

Vertical-oscillator section.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 750 Ω
Transconductance: 0.0072 S
Amplification factor: 5.4
Max plate voltage: 330 V
Max plate dissipation: 11 W
Max cathode current: 50 mA

Vertical-deflection amplifier section; 1500 V pulse plate rating preserved as parameter.

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

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Typical Plate Voltage
250 V
Section1

Characteristic

Typical Plate Current
1.4 mA
Section1

SECTION 2

Triode

Other

Peak Positive Pulse Plate Voltage
1500 V
Section2
Typical Plate Voltage
150 V
Section2

Data set 02

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater voltage
6.3 V
Heater current
985 mA
Plate voltage
250 V
Section1;ClassA
Plate current
1.4 mA
Section1;ClassA
Maximum plate voltage
330 V
Section1

Characteristic

Plate resistance
40000 ohm
Section1
Transconductance
2000 uS
Section1
Amplification factor
70
Section1

SECTION 2

Triode

Other

Plate voltage
150 V
Section2;ClassA
Plate current
50 mA
Section2;ClassA
Maximum plate voltage
330 V
Section2
Peak positive-pulse plate voltage
1500 V
Section2;VerticalDeflection

Characteristic

Plate resistance
750 ohm
Section2
Transconductance
8000 uS
Section2
Amplification factor
6
Section2

Data set 03

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Grid-to-plate capacitance
4.6 pF
Grid-to-cathode/heater capacitance
2.4 pF

Other

Plate voltage
250 V
ClassA
Grid voltage
-3 V
ClassA
Plate current
1.4 mA
ClassA
Average cathode current
22 mA
VerticalDeflection

SECTION 2

Triode

Capacitance

Grid-to-plate capacitance
9 pF
Grid-to-cathode/heater capacitance
6.5 pF

Other

Plate voltage
150 V
ClassA
Grid voltage
-20 V
ClassA
Plate current
50 mA
ClassA
Peak positive-pulse plate voltage
1500 V
VerticalDeflection
Average cathode current
60 mA
VerticalDeflection