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Voltage Radio Detector Converter ·Pentode-Triode

6GX7

Medium-mu triode and sharp-cutoff pentode for VHF television-tuner oscillator and mixer service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9QA
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 400 mA

Description

Medium-mu triode and sharp-cutoff pentode for VHF television-tuner oscillator-mixer service.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 9QA
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 400 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9QA - 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: 4700 Ω
Transconductance: 0.013 S
Max plate voltage: 275 V
Max plate dissipation: 1.5 W
Max cathode current: 20 mA

Medium-mu triode oscillator unit.

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 200000 Ω
Transconductance: 0.011 S
Max plate voltage: 275 V
Max screen voltage: 275 V
Max plate dissipation: 2.2 W
Max screen dissipation: 0.45 W
Max cathode current: 20 mA

Sharp-cutoff pentode mixer unit.

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

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Transconductance
13000 uS

Other

Maximum plate voltage
275 V
Maximum plate dissipation
1.5 W
Maximum cathode current
20 mA
Heater voltage
6.3 V
Heater current
400 mA

SECTION 2

Pentode

Characteristic

Transconductance
11000 uS

Other

Maximum plate voltage
275 V
Maximum plate dissipation
2.2 W
Maximum screen-grid dissipation
0.45 W
Maximum cathode current
20 mA
Heater voltage
6.3 V
Heater current
400 mA

Data set 02

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Grid-to-plate capacitance
1.6 pF

Other

Plate voltage
125 V
Grid No.1 voltage
-1 V
Plate current
13 mA

SECTION 2

Pentode

Capacitance

Grid No.1-to-plate capacitance
0.005 pF

Other

Plate voltage
125 V
Screen-grid voltage
125 V
Grid No.1 voltage
-1 V
Plate current
8 mA