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Voltage Triode Pentode ·Pentode-Triode

6JC8

Medium-mu triode and sharp-cutoff pentode miniature combination with controlled heater warm-up.

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

Description

6JC8 is a medium-mu triode— sharp-cutoff pentode 9-pin miniature type with heater having controlled warm-up time general data ,r'\ electrical: heater characteristics and ratings ldesiun-maximum valued.

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
9PA
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

9PA - 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

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
300000 Ω
Transconductance
0.0055 S
Max plate voltage
330 V
Max screen voltage
330 V
Max plate dissipation
2.3 W
Max screen dissipation
0.45 W

Sharp-cutoff pentode mixer section.

Section 2

Triode

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

Medium-mu oscillator triode section.

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

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 2

Triode

Other

  • Voltage (AC or DC)

    6.3 V

    Published table value column 1

  • Voltage (AC or DC)

    6.3 V

    Published table value column 2

  • Voltage (AC or DC)

    0.6 V

    Published table value column 3

  • Current

    450 mA

    Published table value column 1

  • Current

    30 mA

    Published table value column 2

  • Current

    450 mA

    Published table value column 3

  • Warm-up time (Average)

    11 s

    Published table value

  • respect to cathode

    200 V

    Published table value

  • Grid to plate

    1.3 pF

    Published table value

  • Grid to cathode and heater

    2.8 pF

    Published table value column 1

  • Grid to cathode and heater

    3.2 pF

    Published table value column 2

  • Grid No.i to plate

    0.038 pF

    Published table value column 1

  • Grid No.i to plate

    0.018 pF

    Published table value column 2

  • grid No

    2 pF

    Published table value column 1

  • grid No

    0.9 pF

    Published table value column 2

  • grid No

    1.6 pF

    Published table value column 3

  • triode plate

    0 pF

    Published table value column 1

  • triode plate

    0.036 pF

    Published table value column 2

  • triode plate

    0.075 pF

    Published table value column 1

  • triode plate

    0.012 pF

    Published table value column 2

  • Plate Voltage

    125 V

    Published table value column 1

  • Plate Voltage

    100 V

    Published table value column 2

  • Plate Voltage

    125 V

    Published table value column 3

  • Grid-No

    2 V

    Published table value column 1

  • Grid-No

    70 V

    Published table value column 2

  • Grid-No

    125 V

    Published table value column 3

  • Grid-No.l Voltage

    -1 V

    Published table value column 1

  • Grid-No.l Voltage

    0 V

    Published table value column 2

  • Grid-No.l Voltage

    -1 V

    Published table value column 3

  • Plate Current

    12 mA

    Published table value column 1

  • Plate Current

    9 mA

    Published table value column 2

  • Grid-No

    2 mA

    Published table value column 1

  • Grid-No

    2.2 mA

    Published table value column 2

  • for plate µa =

    20 V

    Published table value column 1

  • for plate µa =

    -7 V

    Published table value column 2

  • for plate µa =

    6.5 V

    Published table value column 3

  • PLATE VOLTAGE

    275 V

    Published table value column 1

  • PLATE VOLTAGE

    275 V

    Published table value column 2

  • SUPPLY VOLTAGE

    275 V

    Published table value

  • PLATE DISSIPATION

    1.7 W

    Published table value column 1

  • PLATE DISSIPATION

    2.3 W

    Published table value column 2

  • For cathode-bias operation

    0.5 MΩ

    Published table value

Characteristics

  • Plate Resistance (Approx.)

    6000 Ω

    Published table value column 1

  • Plate Resistance (Approx.)

    300000 Ω

    Published table value column 2

  • Transconductance

    6500 µS

    Published table value column 1

  • Transconductance

    5700 µS

    Published table value column 2

  • Transconductance

    5500 µS

    Published table value column 3

Data set 02

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Maximum Plate Voltage

    275 V

    Section2

  • Maximum Screen Voltage

    275 V

    Section2

  • Maximum Plate Dissipation

    2.3 W

    Section2

  • Maximum Screen Dissipation

    0.45 W

    Section2

Characteristic

  • Plate Resistance

    300000 ohm

    Section2

  • Transconductance

    5500 uS

    Section2

SECTION 2

Triode

Other

  • s ip^\t/\_-l/©ST

    6 V

    Other;PublishedValue1

  • s ip^\t/\_-l/©ST

    9 V

    Other;PublishedValue2

  • "©

    6.3 A

    Other;PublishedValue1

  • "©

    450 mA

    Other;PublishedValue2

  • is

    11 s

    Other;PublishedValue1

  • is

    200 s

    Other;PublishedValue2

  • Plate

    275 V

    MaximumRating;PublishedValue1

  • Plate

    275 V

    MaximumRating;PublishedValue2

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

    275 V

    MaximumRating

  • 0

    0 V

    MaximumRating

  • Plate Dissipation

    1.7 W

    MaximumRating;PublishedValue1

  • Plate Dissipation

    2.3 W

    MaximumRating;PublishedValue2

  • For grid-No.2 voltages up to 137.5 volts

    0.45 V

    MaximumRating

  • For fixed-bias operation

    0.1 megohm

    MaximumCircuitValue

  • For cathode-bias operation

    0.5 megohm

    MaximumCircuitValue

  • Maximum Plate Voltage

    275 V

    Section1

  • Maximum Plate Dissipation

    1.7 W

    Section1

Characteristic

  • Plate Voltage

    125 V

    Characteristic;PublishedValue1

  • Plate Voltage

    100 V

    Characteristic;PublishedValue2

  • Plate Voltage

    125 V

    Characteristic;PublishedValue3

  • GrH-No.2 Voltage

    70 V

    Characteristic;PublishedValue1

  • GrH-No.2 Voltage

    125 V

    Characteristic;PublishedValue2

  • — 0

    -1 V

    Characteristic

  • Plate Resistance (Approx.)

    6000 ohm

    Characteristic;PublishedValue1

  • Plate Resistance (Approx.)

    300000 ohm

    Characteristic;PublishedValue2

  • Grid-No.2 Current

    2.2 mA

    Characteristic

  • 20 uA

    -7 uA

    Characteristic;PublishedValue1

  • 20 uA

    6.5 uA

    Characteristic;PublishedValue2

  • Plate Resistance

    6000 ohm

    Section1

  • Transconductance

    6500 uS

    Section1

  • Amplification Factor

    40

    Section1