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Voltage Radio Detector Converter ·Pentode-Triode

5FG7

Medium-mu triode plus sharp-cutoff pentode used as a combined oscillator and mixer in VHF television 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 plus sharp-cutoff pentode used as a combined oscillator and mixer in VHF television receivers.

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.

TerminalSectionConnectionEvidence
PIN1Base PinBG1 — Control Grid

Literal label 2G1; manufacturer confirmation pending

Unverified

EIA Base Connections printed p132, 9GF

PIN2Base PinBP — Plate (Anode)

Literal label 2P; manufacturer confirmation pending

Unverified

EIA Base Connections printed p132, 9GF

PIN3Base PinAG3 — 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 PinAP — Plate (Anode)

Literal label 1P; manufacturer confirmation pending

Unverified

EIA Base Connections printed p132, 9GF

PIN7Base PinAG2 — Screen Grid

Literal label 1G2; manufacturer confirmation pending

Unverified

EIA Base Connections printed p132, 9GF

PIN8Base PinAG3 — 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 PinAG1 — 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
5700 Ω
Transconductance
0.0075 S
Amplification factor
43
Max plate voltage
330 V
Max plate dissipation
2.5 W

Medium-mu triode section; 6FG7 counterpart.

Section 2

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
180000 Ω
Transconductance
0.006 S
Max plate voltage
330 V
Max screen voltage
330 V
Max plate dissipation
2.5 W
Max screen dissipation
0.55 W

Sharp-cutoff pentode section; 6FG7 counterpart.

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

  • Heater voltage

    4.7 V

  • Heater current

    600 mA

SECTION 2

Pentode

Other

  • Heater voltage

    4.7 V

  • Heater current

    600 mA

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

    7400 uS

  • Triode amplification factor

    40

  • Triode plate resistance

    5500 ohm

  • Heater warm-up time

    11 s

Application

  • Application

    Oscillator / phase inverter / vertical oscillator

SECTION 2

Pentode

Other

  • Pentode/tetrode typical plate voltage

    125 V

  • Pentode/tetrode grid2 voltage

    125 V

Characteristics

  • Pentode/tetrode transconductance

    6400 uS

  • Pentode/tetrode plate resistance

    200000 ohm

Application

  • Application

    Mixer / IF / video / general-purpose amplifier

Data set 03

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate voltage

    125 V

    TriodeSection

  • Grid voltage

    -1 V

    TriodeSection

  • Plate current

    13 mA

    TriodeSection

Characteristic

  • Transconductance

    7500 uS

    TriodeSection

  • Amplification factor

    43

    TriodeSection

  • Plate resistance

    5.7 kOhm

    TriodeSection

Capacitance

  • Grid-to-plate capacitance

    1.8 pF

    TriodeSection

SECTION 2

Pentode

Other

  • Maximum screen supply voltage

    330 V

    PentodeSection

  • Plate voltage

    125 V

    PentodeSection

  • Screen voltage

    125 V

    PentodeSection

  • Grid voltage

    -1 V

    PentodeSection

  • Plate current

    11 mA

    PentodeSection

  • Screen current

    4 mA

    PentodeSection

Characteristic

  • Transconductance

    9000 uS

    PentodeSection

  • Plate resistance

    180 kOhm

    PentodeSection

Capacitance

  • Grid-to-plate capacitance

    - to 0.02 pF

    PentodeSection; Maximum

Data set 04

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate voltage

    125 V

    Triode;ClassA

  • Plate current

    13 mA

    Triode;ClassA

  • Heater/filament voltage

    4.7 V

    DerivativeSheet

  • Heater/filament current

    600 mA

    DerivativeSheet

  • Heater warm-up time

    11 s

    ControlledWarmup

Characteristic

  • Plate resistance

    5500 ohm

    Triode

  • Transconductance

    7300 uS

    Triode

  • Amplification factor

    40

    Triode

SECTION 2

Pentode

Other

  • Plate voltage

    125 V

    Pentode;ClassA

  • Screen voltage

    125 V

    Pentode;ClassA

  • Plate current

    11 mA

    Pentode;ClassA

  • Screen current

    4 mA

    Pentode;ClassA

Characteristic

  • Plate resistance

    250000 ohm

    Pentode

  • Transconductance

    6500 uS

    Pentode

Capacitance

  • Grid-to-plate capacitance

    0.02 pF

    Pentode

Data set 05

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater Voltage (ac/dc) 4.7

    6.3 V

    Published in approved 6FG7 target entry; Section1

  • Heater Current 0.6

    450 mA

    Published in approved 6FG7 target entry; Section1

  • Heater Warm-up Time (Average) 11

    11 seconds

    Published in approved 6FG7 target entry; Section1

  • Plate Voltage 330

    330 V

    Published in approved 6FG7 target entry; Section1

  • Grid-No.2 (Screen-Grid) Supply Voltage

    330 V

    Published in approved 6FG7 target entry; Section1

  • Grid-No.l (Control-Grid) Voltage, Positive-bias value 0

    0 V

    Published in approved 6FG7 target entry; Section1

  • Plate Dissipation 2.5

    3 W

    Published in approved 6FG7 target entry; Section1

  • For grid-No.2 voltages up to

    165 V

    Published in approved 6FG7 target entry; Section1

  • For grid-No.2 voltages between 165 and

    330 V

    Published in approved 6FG7 target entry; Section1

  • For grid-No.2 voltages between 165 and 330 volts

    0.55 W

    Published in approved 6FG7 target entry; Section1

  • Plate Voltage 125 100

    125 V

    Published in approved 6FG7 target entry; Section1

  • Grid-No.2 Voltage 100

    125 V

    Published in approved 6FG7 target entry; Section1

  • Grid-No.l Voltage —1 0

    -1 V

    Published in approved 6FG7 target entry; Section1

Capacitance

  • Grid to Plate 1.8

    1.8 pF

    Published in approved 6FG7 target entry; Section1

  • Grid to Cathode, Pentode Grid No.3, and Heater 3

    3 pF

    Published in approved 6FG7 target entry; Section1

  • Plate to Cathode, Pentode Grid No.3, and Heater 1.3

    1.9 pF

    Published in approved 6FG7 target entry; Section1

  • and Heater 2.4

    3.4 pF

    Published in approved 6FG7 target entry; Section1

Characteristic

  • Plate Resistance (Approx.) 5700

    180000 Ω

    Published in approved 6FG7 target entry; Section1

  • Transconductance 7500 7400

    6000 µS

    Published in approved 6FG7 target entry; Section1

  • Grid-No.2 Current — 11

    4 mA

    Published in approved 6FG7 target entry; Section1

  • of 30 n& —6.6 —

    -7.5 V

    Published in approved 6FG7 target entry; Section1

SECTION 2

Pentode

Other

  • Heater Voltage (ac/dc) 4.7

    6.3 V

    Published in approved 6FG7 target entry; Section2

  • Heater Current 0.6

    450 mA

    Published in approved 6FG7 target entry; Section2

  • Heater Warm-up Time (Average) 11

    11 seconds

    Published in approved 6FG7 target entry; Section2

  • Plate Voltage 330

    330 V

    Published in approved 6FG7 target entry; Section2

  • Grid-No.2 (Screen-Grid) Supply Voltage

    330 V

    Published in approved 6FG7 target entry; Section2

  • Grid-No.l (Control-Grid) Voltage, Positive-bias value 0

    0 V

    Published in approved 6FG7 target entry; Section2

  • Plate Dissipation 2.5

    3 W

    Published in approved 6FG7 target entry; Section2

  • For grid-No.2 voltages up to

    165 V

    Published in approved 6FG7 target entry; Section2

  • For grid-No.2 voltages between 165 and

    330 V

    Published in approved 6FG7 target entry; Section2

  • For grid-No.2 voltages between 165 and 330 volts

    0.55 W

    Published in approved 6FG7 target entry; Section2

  • Plate Voltage 125 100

    125 V

    Published in approved 6FG7 target entry; Section2

  • Grid-No.2 Voltage 100

    125 V

    Published in approved 6FG7 target entry; Section2

  • Grid-No.l Voltage —1 0

    -1 V

    Published in approved 6FG7 target entry; Section2

Capacitance

  • Grid to Plate 1.8

    1.8 pF

    Published in approved 6FG7 target entry; Section2

  • Grid to Cathode, Pentode Grid No.3, and Heater 3

    3 pF

    Published in approved 6FG7 target entry; Section2

  • Plate to Cathode, Pentode Grid No.3, and Heater 1.3

    1.9 pF

    Published in approved 6FG7 target entry; Section2

  • and Heater 2.4

    3.4 pF

    Published in approved 6FG7 target entry; Section2

Characteristic

  • Plate Resistance (Approx.) 5700

    180000 Ω

    Published in approved 6FG7 target entry; Section2

  • Transconductance 7500 7400

    6000 µS

    Published in approved 6FG7 target entry; Section2

  • Grid-No.2 Current — 11

    4 mA

    Published in approved 6FG7 target entry; Section2

  • of 30 n& —6.6 —

    -7.5 V

    Published in approved 6FG7 target entry; Section2