Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Voltage Pentode - Sharp Cutoff (single) ·Pentode-Triode

6BA8A

Medium-mu triode plus sharp-cutoff pentode for television video, AGC, reactance, oscillator, and phase-splitter service.

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/AGC/reactance service and low-frequency oscillator/phase-splitter 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

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
6700 Ω
Transconductance
0.0027 S
Amplification factor
18
Max plate voltage
300 V
Max plate dissipation
2 W
Rectifier max heater-cathode voltage
200 V
Rectifier warm-up time
11 s

Published promoted fields populated semantically; identical repeated sections compressed where applicable.

Section 2

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
400000 Ω
Transconductance
0.009 S
Max plate voltage
300 V
Max screen voltage
300 V
Max plate dissipation
3.25 W
Max screen dissipation
1 W
Rectifier max heater-cathode voltage
200 V
Rectifier warm-up time
11 s

Published promoted fields populated semantically; 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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 2

Pentode

Characteristic

  • Heater Voltage . 8.4 Volts

    8.4 V

    Heater Voltage . 8.4 Volts

  • Heater Current 600 450 Volts The 8BA8A is identical to the

    8 A

    Heater Current 600 450 Volts The 8BA8A is identical to the

  • Output: p to Ch + k) 1.9 0.4 uuf 23 Te;

    0.4 pF

    Output: p to Ch + k) 1.9 0.4 uuf 23 Te;

  • Output: p to (h+k+g2+g3+ 1.S.) . 4.5 3.6 uuf

    3.6 pF

    Output: p to (h+k+g2+g3+ 1.S.) . 4.5 3.6 uuf

  • Plate Voltage . . . . . . . . . . . . . . . . .. 200 200 Volts

    200 V

    Plate Voltage . . . . . . . . . . . . . . . . .. 200 200 Volts

  • Grid No. 2 Voltage . . . . . . . . . . . . . . . . 150 Volts

    150 V

    Grid No. 2 Voltage . . . . . . . . . . . . . . . . 150 Volts

  • Grid No. 1 Voltage . . . . . . . . . . . . . . . . -8 0 Volts

    0 V

    Grid No. 1 Voltage . . . . . . . . . . . . . . . . -8 0 Volts

  • Plate Current . . . . . . . . . . .. ... 8.0 13 Ma

    13 mA

    Plate Current . . . . . . . . . . .. ... 8.0 13 Ma

  • Transconductance . . . . . . . . . . . ... 2700 9000 umhos

    9000 umhos

    Transconductance . . . . . . . . . . . ... 2700 9000 umhos

  • Plate Resistance (approx.) . . Ce 6700 400,000 Ohms

    400 Ohms

    Plate Resistance (approx.) . . Ce 6700 400,000 Ohms

  • Grid No. 1 Voltage for Ib = 10 pa (approx ) Co -16 -10 Volts

    -10 V

    Grid No. 1 Voltage for Ib = 10 pa (approx ) Co -16 -10 Volts

  • Plate Current . . . . . 42 Ma

    42 mA

    Plate Current . . . . . 42 Ma

  • Grid No. 2 Current . . . . . . . . . . . . . ... 12.5 Ma

    12.5 mA

    Grid No. 2 Current . . . . . . . . . . . . . ... 12.5 Ma

  • GRID NO.2 VOLTAGE EXPRESSED AS PER CENT

    2 V

    GRID NO.2 VOLTAGE EXPRESSED AS PER CENT

Other

  • Plate Voltage . . . 300 300 Volts Max.

    300 V

    Plate Voltage . . . 300 300 Volts Max.

  • Grid No. 2 Supply Voltage . 300 Volts Max.

    300 V

    Grid No. 2 Supply Voltage . 300 Volts Max.

  • Grid No. 2 Voltage : . See Rating Chart

    2 V

    Grid No. 2 Voltage : . See Rating Chart

  • Plate Dissipation . . 2.0 3.25 Watts Max.

    3.25 W

    Plate Dissipation . . 2.0 3.25 Watts Max.

  • Grid No. 2 Dissipation . . . 1.0 Watt Max.

    1 W

    Grid No. 2 Dissipation . . . 1.0 Watt Max.

  • Negative Grid No. 1 Voltage . 50 Volts Max.

    50 V

    Negative Grid No. 1 Voltage . 50 Volts Max.

  • Positive Grid No. 1 Voltage 0 Volts Max.

    0 V

    Positive Grid No. 1 Voltage 0 Volts Max.

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater Warmup Time

    11 s

SECTION 2

Pentode

Characteristic

  • PentodeTransconductance

    9000 uS

    Section2

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

    150 V

    TriodeSection

  • Plate current

    10 mA

    TriodeSection

Characteristic

  • Plate resistance

    6000 Ω

    TriodeSection

  • Transconductance

    6500 µS

    TriodeSection

  • Amplification factor

    40

    TriodeSection

SECTION 2

Pentode

Other

  • Plate voltage

    125 V

    PentodeSection

  • Screen voltage

    125 V

    PentodeSection

  • Plate current

    12 mA

    PentodeSection

  • Screen current

    3.5 mA

    PentodeSection

Characteristic

  • Plate resistance

    250000 Ω

    PentodeSection

  • Transconductance

    9000 µS

    PentodeSection

  • Cutoff characteristic

    Sharp

    PentodeSection

Data set 04

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Voltage ac or do

    6.3 V

    Section1

  • Current

    600 mA

    Section1

  • Warnrup time (Average)

    11 s

    Section1

  • PTate-Supply Voltage

    65 V

    Section1;PublishedColumn1

  • PTate-Supply Voltage

    200 V

    Section1;PublishedColumn2

  • Grid-No. Supply Voltage

    150 V

    Section1;PublishedColumn1

  • Grid-No.l Voltage

    0 V

    Section1;PublishedColumn1

  • Cathode Resistor

    180 ohm

    Section1

  • (Approx.)

    6700 ohm

    Section1;PublishedColumn1

  • (Approx.)

    400000 ohm

    Section1;PublishedColumn2

  • Plate Current '

    42 mA

    Section1;PublishedColumn1

  • Plate Current '

    13 mA

    Section1;PublishedColumn2

  • Grid-No. Current - '

    12.5 mA

    Section1;PublishedColumn1

  • Grid-No. Current - '

    3.5 mA

    Section1;PublishedColumn2

  • current of µa

    -16 V

    Section1;PublishedColumn1

  • current of µa

    -10 V

    Section1;PublishedColumn2

  • PLATE VOLTAGE max. max

    300 V

    Section1;PublishedColumn1

  • SUPPLY VOLTAGE - max

    300 V

    Section1

  • Negative bias value - max

    50 V

    Section1

  • Positive bias value - max

    0 V

    Section1

  • PLATE DISSIPATION max. max

    2 W

    Section1;PublishedColumn1

  • PLATE DISSIPATION max. max

    3.25 W

    Section1;PublishedColumn2

  • up to

    150 V

    Section1

  • respect to cathode. max. max,

    200 V

    Section1;PublishedColumn1

  • respect to cathode. max. max

    200 V

    Section1;PublishedColumn1

  • operation max. max

    0.5 Mohm

    Section1;PublishedColumn1

  • operation max. max

    0.25 Mohm

    Section1;PublishedColumn2

  • operation max. max

    1 Mohm

    Section1;PublishedColumn1

  • The do component must nat exceed

    100 V

    Section1

Capacitance

  • Grid to plate

    2.2 pF

    Section1;PublishedColumn1

  • heater

    2.5 pF

    Section1;PublishedColumn1

  • heater

    2.7 pF

    Section1;PublishedColumn2

  • heater

    0.4 pF

    Section1;PublishedColumn1

  • heater

    1.9 pF

    Section1;PublishedColumn2

  • Grid No.l to plate

    0.04 pF

    Section1;PublishedColumn1

  • Grid No.l to plate

    0.03 pF

    Section1;PublishedColumn2

  • and heater

    10 pF

    Section1;PublishedColumn1

  • and heater

    3.6 pF

    Section1;PublishedColumn1

  • and heater

    4.5 pF

    Section1;PublishedColumn2

  • plate

    0.016 pF

    Section1;PublishedColumn1

  • plate

    0.006 pF

    Section1;PublishedColumn2

  • triode plate

    0.006 pF

    Section1;PublishedColumn1

  • triode plate

    0.003 pF

    Section1;PublishedColumn2

  • triode plate

    0.15 pF

    Section1;PublishedColumn1

  • triode plate

    0.023 pF

    Section1;PublishedColumn2

SECTION 2

Pentode

Other

  • Voltage ac or do

    6.3 V

    Section2

  • Current

    600 mA

    Section2

  • Warnrup time (Average)

    11 s

    Section2

  • PTate-Supply Voltage

    65 V

    Section2;PublishedColumn1

  • PTate-Supply Voltage

    200 V

    Section2;PublishedColumn2

  • Grid-No. Supply Voltage

    150 V

    Section2;PublishedColumn1

  • Grid-No.l Voltage

    0 V

    Section2;PublishedColumn1

  • Cathode Resistor

    180 ohm

    Section2

  • (Approx.)

    6700 ohm

    Section2;PublishedColumn1

  • (Approx.)

    400000 ohm

    Section2;PublishedColumn2

  • Plate Current '

    42 mA

    Section2;PublishedColumn1

  • Plate Current '

    13 mA

    Section2;PublishedColumn2

  • Grid-No. Current - '

    12.5 mA

    Section2;PublishedColumn1

  • Grid-No. Current - '

    3.5 mA

    Section2;PublishedColumn2

  • current of µa

    -16 V

    Section2;PublishedColumn1

  • current of µa

    -10 V

    Section2;PublishedColumn2

  • PLATE VOLTAGE max. max

    300 V

    Section2;PublishedColumn1

  • SUPPLY VOLTAGE - max

    300 V

    Section2

  • Negative bias value - max

    50 V

    Section2

  • Positive bias value - max

    0 V

    Section2

  • PLATE DISSIPATION max. max

    2 W

    Section2;PublishedColumn1

  • PLATE DISSIPATION max. max

    3.25 W

    Section2;PublishedColumn2

  • up to

    150 V

    Section2

  • respect to cathode. max. max,

    200 V

    Section2;PublishedColumn1

  • respect to cathode. max. max

    200 V

    Section2;PublishedColumn1

  • operation max. max

    0.5 Mohm

    Section2;PublishedColumn1

Capacitance

  • Grid to plate

    2.2 pF

    Section2;PublishedColumn1

  • heater

    2.5 pF

    Section2;PublishedColumn1

  • heater

    2.7 pF

    Section2;PublishedColumn2

  • heater

    0.4 pF

    Section2;PublishedColumn1

  • heater

    1.9 pF

    Section2;PublishedColumn2

  • Grid No.l to plate

    0.04 pF

    Section2;PublishedColumn1

  • Grid No.l to plate

    0.03 pF

    Section2;PublishedColumn2

  • and heater

    10 pF

    Section2;PublishedColumn1

  • and heater

    3.6 pF

    Section2;PublishedColumn1

  • and heater

    4.5 pF

    Section2;PublishedColumn2

  • plate

    0.016 pF

    Section2;PublishedColumn1

  • plate

    0.006 pF

    Section2;PublishedColumn2

  • triode plate

    0.006 pF

    Section2;PublishedColumn1

  • triode plate

    0.003 pF

    Section2;PublishedColumn2

  • triode plate

    0.15 pF

    Section2;PublishedColumn1

  • triode plate

    0.023 pF

    Section2;PublishedColumn2

Data set 05

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater Voltage (ac/dc) 6.3

    8.4 V

    Published in approved 8BA8A target datasheet entry; Section1

  • Heater Current 0.3

    450 mA

    Published in approved 8BA8A target datasheet entry; Section1

  • Heater Warm-up Time (Average)

    11 seconds

    Published in approved 8BA8A target datasheet entry; Section1

  • Pentode Plate to Triode Plate 0.15

    0.023 pF

    Published in approved 8BA8A target datasheet entry; Section1

  • Plate Voltage 300

    300 V

    Published in approved 8BA8A target datasheet entry; Section1

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

    300 V

    Published in approved 8BA8A target datasheet entry; Section1

  • Negative-bias value

    -60 V

    Published in approved 8BA8A target datasheet entry; Section1

  • Positive-bias value

    0 V

    Published in approved 8BA8A target datasheet entry; Section1

  • For grid-No.2 voltages up to

    150 V

    Published in approved 8BA8A target datasheet entry; Section1

  • For grid-No.2 voltages up to 150 volts

    1 W

    Published in approved 8BA8A target datasheet entry; Section1

  • For grid-No.2 voltages between 150 and

    300 V

    Published in approved 8BA8A target datasheet entry; Section1

  • Plate-Supply Voltage 200

    200 V

    Published in approved 8BA8A target datasheet entry; Section1

  • For fixed-bias operation 0.5

    0.25 MΩ

    Published in approved 8BA8A target datasheet entry; Section1

  • For cathode-bias operation 1

    1 MΩ

    Published in approved 8BA8A target datasheet entry; Section1

Capacitance

  • Grid to Plate 2.2

    2.2 pF

    Published in approved 8BA8A target datasheet entry; Section1

  • Grid to Cathode and Heater 2.5

    2.7 pF

    Published in approved 8BA8A target datasheet entry; Section1

  • Plate to Cathode and Heater 0.4

    1.9 pF

    Published in approved 8BA8A target datasheet entry; Section1

  • Grid No.l to Plate 0.06

    0.05 pF

    Published in approved 8BA8A target datasheet entry; Section1

  • No.3. and Internal Shield 10

    10 pF

    Published in approved 8BA8A target datasheet entry; Section1

  • and Internal Shield 3.6 4

    5 pF

    Published in approved 8BA8A target datasheet entry; Section1

  • Triode Grid to Pentode Plate 0.016

    0.006 pF

    Published in approved 8BA8A target datasheet entry; Section1

  • Pentode Grid No.l to Triode Plate 0.006

    0.003 pF

    Published in approved 8BA8A target datasheet entry; Section1

Characteristic

  • Grid-No.2 Supply Voltage

    150 V

    Published in approved 8BA8A target datasheet entry; Section1

  • Grid-No.l Voltage

    -8 V

    Published in approved 8BA8A target datasheet entry; Section1

  • Cathode-Bias Resistor

    180 Ω

    Published in approved 8BA8A target datasheet entry; Section1

  • Plate Resistance (Approx.) 6700

    400000 Ω

    Published in approved 8BA8A target datasheet entry; Section1

  • Plate Current 8

    13 mA

    Published in approved 8BA8A target datasheet entry; Section1

  • Grid-No.2 Current

    3.5 mA

    Published in approved 8BA8A target datasheet entry; Section1

  • 10 n A —16

    -10 V

    Published in approved 8BA8A target datasheet entry; Section1

SECTION 2

Pentode

Other

  • Heater Voltage (ac/dc) 6.3

    8.4 V

    Published in approved 8BA8A target datasheet entry; Section2

  • Heater Current 0.3

    450 mA

    Published in approved 8BA8A target datasheet entry; Section2

  • Heater Warm-up Time (Average)

    11 seconds

    Published in approved 8BA8A target datasheet entry; Section2

  • Pentode Plate to Triode Plate 0.15

    0.023 pF

    Published in approved 8BA8A target datasheet entry; Section2

  • Plate Voltage 300

    300 V

    Published in approved 8BA8A target datasheet entry; Section2

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

    300 V

    Published in approved 8BA8A target datasheet entry; Section2

  • Negative-bias value

    -60 V

    Published in approved 8BA8A target datasheet entry; Section2

  • Positive-bias value

    0 V

    Published in approved 8BA8A target datasheet entry; Section2

  • For grid-No.2 voltages up to

    150 V

    Published in approved 8BA8A target datasheet entry; Section2

  • For grid-No.2 voltages up to 150 volts

    1 W

    Published in approved 8BA8A target datasheet entry; Section2

  • For grid-No.2 voltages between 150 and

    300 V

    Published in approved 8BA8A target datasheet entry; Section2

  • Plate-Supply Voltage 200

    200 V

    Published in approved 8BA8A target datasheet entry; Section2

  • For fixed-bias operation 0.5

    0.25 MΩ

    Published in approved 8BA8A target datasheet entry; Section2

  • For cathode-bias operation 1

    1 MΩ

    Published in approved 8BA8A target datasheet entry; Section2

Capacitance

  • Grid to Plate 2.2

    2.2 pF

    Published in approved 8BA8A target datasheet entry; Section2

  • Grid to Cathode and Heater 2.5

    2.7 pF

    Published in approved 8BA8A target datasheet entry; Section2

  • Plate to Cathode and Heater 0.4

    1.9 pF

    Published in approved 8BA8A target datasheet entry; Section2

  • Grid No.l to Plate 0.06

    0.05 pF

    Published in approved 8BA8A target datasheet entry; Section2

  • No.3. and Internal Shield 10

    10 pF

    Published in approved 8BA8A target datasheet entry; Section2

  • and Internal Shield 3.6 4

    5 pF

    Published in approved 8BA8A target datasheet entry; Section2

  • Triode Grid to Pentode Plate 0.016

    0.006 pF

    Published in approved 8BA8A target datasheet entry; Section2

  • Pentode Grid No.l to Triode Plate 0.006

    0.003 pF

    Published in approved 8BA8A target datasheet entry; Section2

Characteristic

  • Grid-No.2 Supply Voltage

    150 V

    Published in approved 8BA8A target datasheet entry; Section2

  • Grid-No.l Voltage

    -8 V

    Published in approved 8BA8A target datasheet entry; Section2

  • Cathode-Bias Resistor

    180 Ω

    Published in approved 8BA8A target datasheet entry; Section2

  • Plate Resistance (Approx.) 6700

    400000 Ω

    Published in approved 8BA8A target datasheet entry; Section2

  • Plate Current 8

    13 mA

    Published in approved 8BA8A target datasheet entry; Section2

  • Grid-No.2 Current

    3.5 mA

    Published in approved 8BA8A target datasheet entry; Section2

  • 10 n A —16

    -10 V

    Published in approved 8BA8A target datasheet entry; Section2