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Power - Pentode (NOT beam) ·Pentode-Triode

8EB8

Triode/pentode television signal-processing tube for sync, sound-IF, phase-inverter, and video-amplifier service.

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

Description

High-mu triode and sharp-cutoff pentode for television sync, sound-IF, phase-inverter, and video-amplifier service.

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
NOVAL
Socket code
B9A
Base pins
9
Nominal heater voltage
8 V
Nominal heater current
450 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

NOVAL - 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

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
37000 Ω
Transconductance
0.0027 S
Amplification factor
100
Max plate voltage
330 V
Max plate 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.

Section 2

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
60000 Ω
Transconductance
0.0115 S
Max plate voltage
330 V
Max screen voltage
330 V
Max plate dissipation
5 W
Max screen dissipation
1.1 W
Rectifier max heater-cathode voltage
200 V
Rectifier warm-up time
11 s

Published promoted fields populated semantically; identical repeated sections compressed.

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

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater voltage

    8 V

    Rated heater condition

  • Heater current

    600 mA

    Rated heater condition

Other

  • Voltag.(acordc)

    8 V

    Voltag.(acordc) .......... 6.3±10% 8.0 Volts Plate Voltage .... 330 330 max. Volts

  • Warm-upTime(approx.)A

    11 s

    Warm-upTime(approx.)A ...... 11 Seconds Grid 2 Voltage .... -- See cE-A825

  • Base,,,,,

    125 V

    Base,,,,,..,...I....... Grid2Voltage .............-- T25 125 Volts

  • Plate Resistance(opprox.)

    -75000 ohm

    Plate Resistance(opprox.) .... 37000 --75000 Ohms

  • Gi.id2Current

    7 mA

    Gi.id2Current .............-- 15* 7 Ma.

SECTION 2

Pentode

Characteristic

  • Heater voltage

    8 V

    Rated heater condition

  • Heater current

    600 mA

    Rated heater condition

Data set 02

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate Voltage

    250 V

  • Grid 1 Voltage

    -2 V

  • Plate Current

    2 mA

Characteristics

  • Grid-to-Plate Capacitance

    4.4 pF

SECTION 2

Pentode

Other

  • Plate Voltage

    200 V

  • Screen Voltage

    125 V

  • Plate Current

    25 mA

  • Screen Current

    7 mA

Characteristics

  • Input Capacitance

    11 pF

  • Output Capacitance

    4.2 pF

Data set 03

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater Warm-up Time (Average) —

    11 s

    Characteristic;PublishedValue1

  • Heater Warm-up Time (Average) —

    11 s

    Characteristic;PublishedValue2

  • Peak value

    200 V

    Characteristic;PublishedValue1

  • Peak value

    200 V

    Characteristic;PublishedValue2

  • Peak value

    200 V

    Characteristic;PublishedValue3

  • Average value

    100 V

    Characteristic;PublishedValue1

  • Average value

    100 V

    Characteristic;PublishedValue2

  • Average value

    100 V

    Characteristic;PublishedValue3

  • Plate Supply Voltage

    250 V

    Characteristic;PublishedValue1

  • Plate Supply Voltage

    60 V

    Characteristic;PublishedValue2

  • Plate Supply Voltage

    200 V

    Characteristic;PublishedValue3

  • Grid-No.l Voltage —

    2 V

    Characteristic;PublishedValue1

  • Grid-No.l Voltage —

    0 V

    Characteristic;PublishedValue2

  • Plate Resistance (Approx.)

    37000 ohm

    Characteristic;PublishedValue1

  • Plate Resistance (Approx.)

    60000 ohm

    Characteristic;PublishedValue2

  • Grid-No

    2 mA

    Characteristic;PublishedValue1

  • Grid-No

    18 mA

    Characteristic;PublishedValue2

  • Grid-No

    5.5 mA

    Characteristic;PublishedValue3

  • Grid Voltage (Approx.) for plate current of

    20 V

    Characteristic;PublishedValue1

  • Grid Voltage (Approx.) for plate current of

    -5 V

    Characteristic;PublishedValue2

  • Grid-No.l Voltage (Approx.) for plate current

    100 uA

    Characteristic;PublishedValue1

  • Grid-No.l Voltage (Approx.) for plate current

    -10 uA

    Characteristic;PublishedValue2

  • Plate Resistance

    37000 ohm

    Section1

  • Transconductance

    2700 uS

    Section1

  • Amplification Factor

    100

    Section1

Other

  • Plate Voltage

    330 V

    MaximumRating;PublishedValue1

  • Plate Voltage

    330 V

    MaximumRating;PublishedValue2

  • Grid-No

    2 V

    MaximumRating;PublishedValue1

  • Grid-No

    330 V

    MaximumRating;PublishedValue2

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

    0 V

    MaximumRating;PublishedValue1

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

    0 V

    MaximumRating;PublishedValue2

  • Plate Dissipation

    1 W

    MaximumRating;PublishedValue1

  • Plate Dissipation

    5 W

    MaximumRating;PublishedValue2

  • For grid-No

    2 V

    MaximumRating;PublishedValue1

  • For grid-No

    165 V

    MaximumRating;PublishedValue2

  • Published value

    1.1 W

    MaximumRating

  • For grid-No

    2 V

    MaximumRating;PublishedValue1

  • For grid-No

    165 V

    MaximumRating;PublishedValue2

  • For grid-No

    330 V

    MaximumRating;PublishedValue3

  • For grid-No

    300 V

    MaximumRating;PublishedValue4

  • For fixed-bias operation

    0.5 megohm

    MaximumCircuitValue;PublishedValue1

  • For fixed-bias operation

    0.25 megohm

    MaximumCircuitValue;PublishedValue2

  • For cathode-bias operation

    1 megohm

    MaximumCircuitValue;PublishedValue1

  • For cathode-bias operation

    1 megohm

    MaximumCircuitValue;PublishedValue2

  • Maximum Plate Voltage

    330 V

    Section1

  • Maximum Plate Dissipation

    1 W

    Section1

SECTION 2

Pentode

Other

  • Maximum Plate Voltage

    330 V

    Section2

  • Maximum Screen Voltage

    330 V

    Section2

  • Maximum Plate Dissipation

    5 W

    Section2

  • Maximum Screen Dissipation

    1.1 W

    Section2

Characteristic

  • Plate Resistance

    60000 ohm

    Section2

  • Transconductance

    11500 uS

    Section2