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Voltage Radio Detector Converter ·Pentode-Triode

6CG8A

Triode-pentode television converter family combining oscillator and mixer functions for VHF tuner frequency-changing service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
9GF
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 450 mA

Description

TriodePentode vacuum tube described in the supplied RCA source.

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
6.3 V
Nominal heater current
450 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

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
300000 Ω
Transconductance
0.0057 S
Max plate voltage
275 V
Max screen voltage
275 V
Max plate dissipation
2.3 W
Max screen dissipation
0.45 W

Sharp-cutoff pentode

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
6000 Ω
Transconductance
0.0065 S
Amplification factor
40
Max plate voltage
275 V
Max plate dissipation
1.7 W

Medium-mu triode

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

Pentode

Other

  • Heater voltage

    6.3 V

  • Heater current

    300 mA

  • Plate voltage

    275 V

    Typical operating conditions

  • Plate current

    136.2 mA

    Typical operating conditions

SECTION 2

Triode

Other

  • Heater voltage

    6.3 V

  • Heater current

    300 mA

  • Plate voltage

    275 V

    Typical operating conditions

  • Plate current

    136.2 mA

    Typical operating conditions

Data set 02

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Plate Voltage

    250 V

  • Screen Voltage

    150 V

  • Cathode Bias Resistor

    200 ohm

  • Plate Resistance

    750000 ohm

  • Transconductance

    4600 uS

  • Grid-Plate Capacitance

    0.016 pF

    Shielded

  • Input Capacitance

    5 pF

    Shielded

  • Output Capacitance

    1.6 pF

    Shielded

SECTION 2

Triode

Characteristics

  • Heater Voltage

    6.3 V

  • Heater Current

    450 mA

  • Plate Voltage

    100 V

  • Cathode Bias Resistor

    100 ohm

  • Amplification Factor

    40 ratio

  • Plate Resistance

    6900 ohm

  • Transconductance

    5800 uS

  • Grid-Plate Capacitance

    1.5 pF

Other

  • Typical Oscillator Frequency

    250 MHz

    Oscillator

Data set 03

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

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

  • Heater-to-cathode capacitance

    5.5 pF

    BothSections

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

SECTION 2

Triode

Capacitance

  • Triode grid-to-plate capacitance

    1.5 pF

    Section1

  • Triode grid-to-cathode-and-heater capacitance

    2.6 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 warm-up time

    11 s

Data set 04

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

  • Grid No.l to plate

    0.09 pF

    Published table column 1 of 2

  • Grid No.l to plate

    0.06 pF

    Published table column 2 of 2

  • triode plate

    0.05 pF

    Published table column 1 of 2

  • triode plate

    0.04 pF

    Published table column 2 of 2

  • triode plate

    0.008 pF

    Published table column 2 of 2

  • Heater to cathode

    6.5 pF

    Published table column 1 of 2

  • Heater to cathode

    6.5 pF

    Published table column 2 of 2

Characteristics

  • Plate Voltage

    125 V

    Published table column 1 of 3

  • Plate Voltage

    100 V

    Published table column 2 of 3

  • Plate Voltage

    125 V

    Published table column 3 of 3

  • Grid-No.l Voltage

    -1 V

    Published table column 1 of 2

  • Grid-No.l Voltage

    -1 V

    Published table column 2 of 2

  • Plate Resistance (Approx.)

    6000 Ω

    Published table column 1 of 2

  • Plate Resistance (Approx.)

    300000 Ω

    Published table column 2 of 2

  • Transconductance

    6500 µS

    Published table column 1 of 3

  • Transconductance

    5700 µS

    Published table column 2 of 3

  • Transconductance

    5500 µS

    Published table column 3 of 3

  • Plate Current

    12 mA

    Published table column 1 of 2

  • Plate Current

    9 mA

    Published table column 2 of 2

  • for plate µa =

    20 V

    Published table column 1 of 3

  • for plate µa =

    -7 V

    Published table column 2 of 3

  • for plate µa =

    -6.5 V

    Published table column 3 of 3

  • Plate Voltage

    125 V

    ClassA

  • Screen Voltage

    125 V

    ClassA

  • Plate Resistance

    300000 Ω

    ClassA

  • Transconductance

    5500 µS

    ClassA

Other

  • PLATE VOLTAGE

    275 V

    Published table column 1 of 2

  • PLATE VOLTAGE

    275 V

    Published table column 2 of 2

  • SUPPLY VOLTAGE

    275 V

  • Positive-bias value

    0 V

    Published table column 1 of 2

  • Positive-bias value

    0 V

    Published table column 2 of 2

  • up to

    137.5 W

    Published table column 1 of 2

  • up to

    0.45 W

    Published table column 2 of 2

  • volts - See Grid-No.~ In

    4 V

  • PLATE DISSIPATION

    1.7 W

    Published table column 1 of 2

  • PLATE DISSIPATION

    2.3 W

    Published table column 2 of 2

  • respect to cathode

    200 V

    Published table column 1 of 2

  • respect to cathode

    200 V

    Published table column 2 of 2

  • The do component must not exceed

    100 V

SECTION 2

Triode

Characteristics

  • Warm-up time (Average)

    11 s

  • Plate Voltage

    125 V

    ClassA

  • Amplification Factor

    40

    ClassA

  • Plate Resistance

    6000 Ω

    ClassA

  • Transconductance

    6500 µS

    ClassA

Capacitance

  • Grid to plate

    15 pF

    Published table column 1 of 2

  • Grid to plate

    1.5 pF

    Published table column 2 of 2

Data set 05

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 2

Triode

Capacitance

  • Grid to Plate

    1.5 pF

    Published datasheet value

  • Grid to Cathode, Heater, and Pentode Grid No

    2.4 pF

    Published datasheet value

  • Plate to Cathode, Heater, and Pentode Grid No

    1 pF

    Published datasheet value

  • Plate to Cathode, Heater, Grid No

    2

    Published datasheet value

  • Pentode Plate to Triode Plate

    0.008 pF

    Published datasheet value

  • Heater to Cathode

    6.5 pF

    Published datasheet value

Characteristic

  • Peak Inverse Plate Voltage*

    5500 volts

    Published datasheet value

  • Peak Plate Current

    2100 mA

    Published datasheet value

  • Average Plate Current

    350 mA

    Published datasheet value

  • Plate Dissipation

    6.5 watts

    Published datasheet value