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Voltage Radio Detector Converter ·Pentode-Triode

5CG8

Medium-mu triode and sharp-cutoff pentode used as a combined oscillator and mixer in television and AM/FM receivers.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9GF
Socket code: B9A
Base pins: 9
Nominal heater: 4.7 V / 600 mA

Description

Medium-mu triode and sharp-cutoff pentode used as combined oscillator and mixer in television and AM/FM receivers. Electrical ratings, characteristics, and capacitances were interpreted from the supplied RCA manual excerpt where reproduced; reference-only entries were not supplemented from outside sources.

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: 9GF
Socket code: B9A
Base pins: 9
Nominal heater voltage: 4.7 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9GF - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1Base Pin	B	G1 — Control Grid Literal label 2G1; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9GF
PIN2Base Pin	B	P — Plate (Anode) Literal label 2P; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9GF
PIN3Base Pin	A	G3 — Suppressor GridGroup 9GF3 Literal label 1G3; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9GF
PIN3Base Pin	—	K — CathodeGroup 9GF3 Literal label K; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9GF
PIN4Base Pin	—	H — Heater Literal label H; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9GF
PIN5Base Pin	—	H — Heater Literal label H; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9GF
PIN6Base Pin	A	P — Plate (Anode) Literal label 1P; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9GF
PIN7Base Pin	A	G2 — Screen Grid Literal label 1G2; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9GF
PIN8Base Pin	A	G3 — Suppressor GridGroup 9GF8 Literal label 1G3; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9GF
PIN8Base Pin	—	K — CathodeGroup 9GF8 Literal label K; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9GF
PIN9Base Pin	A	G1 — Control Grid Literal label 1G1; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9GF

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 5000 Ω
Transconductance: 0.0065 S
Amplification factor: 40
Max plate voltage: 275 V
Max plate dissipation: 1.7 W
Rectifier max heater-cathode voltage: 200 V
Rectifier warm-up time: 11 s

Referenced ratings not printed in this source; not inferred.

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 300000 Ω
Transconductance: 0.0055 S
Max plate voltage: 275 V
Max screen voltage: 275 V
Max plate dissipation: 2.3 W
Max screen dissipation: 0.45 W
Rectifier max heater-cathode voltage: 200 V
Rectifier warm-up time: 11 s

Referenced ratings not printed in this source; not inferred.

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
125 V
ClassA

SECTION 2

Pentode

Other

Plate voltage
125 V
ClassA
Screen voltage
125 V
ClassA

Data set 02

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Triode typical plate voltage
125 V
Heater-cathode voltage maximum
200 V

Characteristics

Triode transconductance
5800 uS
Triode amplification factor
40
Triode plate resistance
6900 ohm
Heater warm-up time
11 s

Application

Application
Oscillator / phase inverter / vertical oscillator

Capacitance

Triode grid-to-plate capacitance
1.5 pF

SECTION 2

Pentode

Other

Pentode/tetrode typical plate voltage
250 V
Pentode/tetrode grid2 voltage
125 V

Characteristics

Pentode/tetrode transconductance
4600 uS
Pentode/tetrode plate resistance
750000 ohm

Application

Application
Mixer / IF / video / general-purpose amplifier

Capacitance

Pentode grid1-to-plate capacitance maximum
0.016 pF

Data set 03

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater/filament voltage
4.7 V
Published rating
Heater/filament current
600 mA
Published rating

Capacitance

Pentode grid-to-plate capacitance
0.02 pF
WithShield

Other

Application
Combined oscillator and mixer
TelevisionService

Data set 04

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater Warmup Time
11 s

Data set 05

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Triode grid-to-plate capacitance
1.5 pF
Section1

Other

Plate voltage
150 V
Oscillator;250MHz
Oscillator grid resistor
2700 ohm
Oscillator;250MHz
Plate current
4.3 mA
Oscillator;250MHz
Grid #1 current
3.6 mA
Oscillator;250MHz
Oscillator power output
0.5 W
Oscillator;250MHz
Heater/filament voltage
4.7 V
DerivativeSheet
Heater/filament current
600 mA
DerivativeSheet
Heater warm-up time
11 s
ControlledWarmup

SECTION 2

Pentode

Capacitance

Pentode grid-to-plate capacitance
0.03 pF
Section2
Pentode input capacitance
4.8 pF
Section2
Pentode output capacitance
0.9 pF
Section2

Other

Plate voltage
150 V
Mixer
Grid #2 voltage
150 V
Mixer
Plate current
6.2 mA
Mixer
Grid #2 current
1.8 mA
Mixer
Grid #1 circuit resistance
120000 ohm
Mixer

Characteristic

Conversion transconductance
4100 uS
Mixer

Data set 06

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Grid-to-plate capacitance
1.5 pF
Unshielded
Grid-to-plate capacitance
1.5 pF
Shielded

SECTION 2

Pentode

Capacitance

Grid No.1-to-plate capacitance
0.04 pF
Unshielded Max
Grid No.1-to-plate capacitance
0.02 pF
Shielded Max