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Voltage Triode Pentode ·Pentode-Triode

6AU8A

Combined triode-pentode for television video, IF, AGC, sync, burst, band-pass, or related signal-processing stages.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
9DX
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 600 mA

Description

Medium-mu triode plus sharp-cutoff pentode for television video/IF/AGC and sync-amplifier, sync-separator, sync-clipper, and phase-inverter circuits.

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
9DX
Socket code
B9A
Base pins
9
Nominal heater voltage
6.3 V
Nominal heater current
600 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

9DX - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN12KBK — Cathode

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN22G1BG1 — Control Grid

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN32PBP — Plate (Anode)

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN4H—H — Heater

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN5H—H — Heater

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN61G3AG3 — Suppressor GridGroup 9DX6

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN6ISAIS — Internal ScreenGroup 9DX6

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN61KAK — CathodeGroup 9DX6

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN71G1AG1 — Control Grid

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN81G2AG2 — Screen Grid

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN91PAP — Plate (Anode)

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

Section ratings

2 physical sections, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
100000 Ω
Transconductance
0.008 S
Max plate voltage
300 V
Max screen voltage
330 V
Max plate dissipation
3 W
Max screen dissipation
1 W
Rectifier max heater-cathode voltage
200 V

Promoted from published ratings/characteristics; identical repeated sections compressed where applicable.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
8100 Ω
Transconductance
0.0053 S
Amplification factor
43
Max plate voltage
300 V
Max plate dissipation
2.5 W
Rectifier max heater-cathode voltage
200 V

Promoted from published ratings/characteristics; identical repeated sections compressed where applicable.

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

    600 mA

  • Plate voltage

    200 V

    ClassA1

  • Grid 2 voltage

    125 V

    ClassA1

Capacitance

  • Pentode grid to plate

    0.06 pF

SECTION 2

Triode

Other

  • Plate voltage

    150 V

    ClassA1

Capacitance

  • Triode grid to plate

    2.2 pF

Data set 02

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater voltage

    6.3 V

  • Heater current

    600 mA

Other

  • Maximum plate voltage

    300 V

  • Maximum screen supply voltage

    300 V

  • Maximum plate dissipation

    3 W

  • Maximum screen dissipation

    1 W

Capacitance

  • Grid-to-plate capacitance

    0.04 pF

  • Input capacitance

    10 pF

  • Output capacitance

    4.5 pF

SECTION 2

Triode

Characteristics

  • Heater voltage

    6.3 V

  • Heater current

    600 mA

  • Amplification factor

    20

  • Plate resistance

    6250 ohm

  • Transconductance

    3200 uS

Other

  • Maximum plate voltage

    300 V

  • Typical plate voltage

    150 V

Capacitance

  • Grid-to-plate capacitance

    2.2 pF

  • Input capacitance

    3.4 pF

  • Output capacitance

    3 pF

Data set 03

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater voltage nominal

    6.3 V

  • Heater current

    600 mA

  • Maximum plate voltage

    330 V

    ClassA1

  • Maximum plate dissipation

    3.3 W

    ClassA1

  • Maximum screen supply voltage

    330 V

    ClassA1

  • Maximum screen input at <=165 V

    1 W

    ClassA1

Characteristics

  • Heater warm-up time

    11 s

    Average

  • Plate supply voltage

    200 V

    ClassA1

  • Screen supply voltage

    125 V

    ClassA1

  • Cathode resistor

    82 ohm

    ClassA1

  • Plate resistance

    100000 ohm

    ClassA1

  • Transconductance

    8000 µS

    ClassA1

  • Plate current

    17 mA

    ClassA1

  • Screen current

    3.4 mA

    ClassA1

SECTION 2

Triode

Other

  • Heater voltage nominal

    6.3 V

  • Heater current

    600 mA

  • Maximum plate voltage

    330 V

    ClassA1

  • Maximum plate dissipation

    2.8 W

    ClassA1

Characteristics

  • Heater warm-up time

    11 s

    Average

  • Plate supply voltage

    150 V

    ClassA1

  • Cathode resistor

    150 ohm

    ClassA1

  • Amplification factor

    43

    ClassA1

  • Plate resistance

    8100 ohm

    ClassA1

  • Transconductance

    5300 µS

    ClassA1

  • Plate current

    9.5 mA

    ClassA1

Data set 04

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater Current

    600 mA

    Published in approved 6AU8A target entry; Section2

  • Heater Warm-up Time (Average)

    11 seconds

    Published in approved 6AU8A target entry; Section2

  • Plate Voltage 330

    330 V

    Published in approved 6AU8A target entry; Section2

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

    330 V

    Published in approved 6AU8A target entry; Section2

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

    0 V

    Published in approved 6AU8A target entry; Section2

  • Plate Dissipation 2.8

    3.3 W

    Published in approved 6AU8A target entry; Section2

  • For grid-No. 2 voltages up to

    165 V

    Published in approved 6AU8A target entry; Section2

  • For grid-No. 2 voltages up to 165 volts

    1 W

    Published in approved 6AU8A target entry; Section2

  • For grid-No.2 voltages between 165 and

    330 V

    Published in approved 6AU8A target entry; Section2

  • Plate Supply Voltage 150

    200 V

    Published in approved 6AU8A target entry; Section2

  • Grid-No.2 Supply Voltage

    125 V

    Published in approved 6AU8A target entry; Section2

  • For fixed-bias operation 0.5

    0.25 MΩ

    Published in approved 6AU8A target entry; Section2

  • For cathode-bias operation 1

    1 MΩ

    Published in approved 6AU8A target entry; Section2

  • Heater Voltage (ac/dc) 6.3 12.6

    25 V

    Published in approved 6AU8A target entry; Section2

  • Heater Current 1.2 0.6

    300 mA

    Published in approved 6AU8A target entry; Section2

Capacitance

  • Grid to Plate

    2.2 pF

    Published in approved 6AU8A target entry; Section2

  • Grid to Cathode and Heater

    2.6 pF

    Published in approved 6AU8A target entry; Section2

  • Plate to Cathode and Heater

    0.34 pF

    Published in approved 6AU8A target entry; Section2

  • Grid No.l to Plate

    0.06 pF

    Published in approved 6AU8A target entry; Section2

  • Internal Shield

    7.5 pF

    Published in approved 6AU8A target entry; Section2

  • Internal Shield

    3.4 pF

    Published in approved 6AU8A target entry; Section2

Characteristic

  • Plate Resistance (Approx.) 8100

    100000 Ω

    Published in approved 6AU8A target entry; Section2

  • Transconductance 5300

    8000 µS

    Published in approved 6AU8A target entry; Section2

  • Plate Current 9.5

    17 mA

    Published in approved 6AU8A target entry; Section2

  • Grid-No.2 Current

    3.4 mA

    Published in approved 6AU8A target entry; Section2

  • 100 ;.A —6.5

    -7.5 V

    Published in approved 6AU8A target entry; Section2

SECTION 2

Triode

Other

  • Heater Current

    600 mA

    Published in approved 6AU8A target entry; Section1

  • Heater Warm-up Time (Average)

    11 seconds

    Published in approved 6AU8A target entry; Section1

  • Plate Voltage 330

    330 V

    Published in approved 6AU8A target entry; Section1

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

    330 V

    Published in approved 6AU8A target entry; Section1

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

    0 V

    Published in approved 6AU8A target entry; Section1

  • Plate Dissipation 2.8

    3.3 W

    Published in approved 6AU8A target entry; Section1

  • For grid-No. 2 voltages up to

    165 V

    Published in approved 6AU8A target entry; Section1

  • For grid-No. 2 voltages up to 165 volts

    1 W

    Published in approved 6AU8A target entry; Section1

  • For grid-No.2 voltages between 165 and

    330 V

    Published in approved 6AU8A target entry; Section1

  • Plate Supply Voltage 150

    200 V

    Published in approved 6AU8A target entry; Section1

  • Grid-No.2 Supply Voltage

    125 V

    Published in approved 6AU8A target entry; Section1

  • For fixed-bias operation 0.5

    0.25 MΩ

    Published in approved 6AU8A target entry; Section1

  • For cathode-bias operation 1

    1 MΩ

    Published in approved 6AU8A target entry; Section1

  • Heater Voltage (ac/dc) 6.3 12.6

    25 V

    Published in approved 6AU8A target entry; Section1

  • Heater Current 1.2 0.6

    300 mA

    Published in approved 6AU8A target entry; Section1

Capacitance

  • Grid to Plate

    2.2 pF

    Published in approved 6AU8A target entry; Section1

  • Grid to Cathode and Heater

    2.6 pF

    Published in approved 6AU8A target entry; Section1

  • Plate to Cathode and Heater

    0.34 pF

    Published in approved 6AU8A target entry; Section1

  • Grid No.l to Plate

    0.06 pF

    Published in approved 6AU8A target entry; Section1

  • Internal Shield

    7.5 pF

    Published in approved 6AU8A target entry; Section1

  • Internal Shield

    3.4 pF

    Published in approved 6AU8A target entry; Section1

Characteristic

  • Plate Resistance (Approx.) 8100

    100000 Ω

    Published in approved 6AU8A target entry; Section1

  • Transconductance 5300

    8000 µS

    Published in approved 6AU8A target entry; Section1

  • Plate Current 9.5

    17 mA

    Published in approved 6AU8A target entry; Section1

  • Grid-No.2 Current

    3.4 mA

    Published in approved 6AU8A target entry; Section1

  • 100 ;.A —6.5

    -7.5 V

    Published in approved 6AU8A target entry; Section1