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Voltage Pentode - Sharp Cutoff (single) ·Pentode

4EJ7

Sharp-cutoff pentode designed for television IF, picture-IF, video, or VHF tuner amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
9A0
Socket code
B9A
Base pins
9
Nominal heater
4.4 V / 450 mA

Description

Sharp-cutoff pentode used as a high-transconductance IF amplifier in color and black-and-white television receivers.

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
9A0
Socket code
B9A
Base pins
9
Nominal heater voltage
4.4 V
Nominal heater current
450 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

9A0 - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
350000 Ω
Transconductance
0.0155 S
Max plate voltage
250 V
Max screen voltage
250 V
Max plate dissipation
2.5 W
Max screen dissipation
0.7 W
Max cathode current
25 mA

Typical Class A1 IF-amplifier characteristics promoted.

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

1953 Amperex

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

  • Input capacitance

    10 pF

    Published source value

  • Output capacitance

    3 pF

    Published source value

  • Plate-to-grid No. 1 capacitance

    - to 0.005 pF

    Published source value

Other

  • Typical plate voltage

    200 V

    Published source value

  • Typical screen-grid voltage

    200 V

    Published source value

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • TransconductancePublished

    15500 uS

Data set 03

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    200 V

    IF amplifier

  • Screen voltage

    200 V

    IF amplifier

  • Grid voltage

    -2.8 V

    IF amplifier

  • Plate current

    10 mA

    IF amplifier

  • Screen current

    4.1 mA

    IF amplifier

Characteristic

  • Transconductance

    15000 uS

    IF amplifier

Data set 04

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

  • GRID #i TO PLATE (MAX.)

    5 pF

    Capacitances | GRID #i TO PLATE (MAX.) .005 pf

Other

  • CURRENT OPERATION

    450130 mA

    Average Characteristics | CURRENT OPERATION 450130 MA

  • HEATER POSITIVE WITH RESPECT TO CATHODE

    150 V

    Average Characteristics | HEATER POSITIVE WITH RESPECT TO CATHODE 150 voLTs

  • HEATER WARM-UP TIME A

    11 s

    Average Characteristics | HEATER WARM-UP TIME A 11 SECONDS

  • GRID #

    550 V

    Maximum Ratings | GRID #2 VOLTAGE WITH Ic2 = O MA 550 VOLTS

  • PLATE DISSIPATION

    2.5 W

    Maximum Ratings | PLATE DISSIPATION 2.5 WATTS

  • GRID #

    0.9 W

    Maximum Ratings | GRID #2 DISSIPATION 0.9 WATTS

  • CATHODE CURRENT Z

    5 mA

    Maximum Ratings | CATHODE CURRENT Z5 MA.

Characteristic

  • GRID #

    5 V

    ClassA | GRID #1 VOLTAGE —Z.5 VOLTS

  • GRID #

    4.1 mA

    ClassA | GRID #2 CURRENT 4.1 MA.

  • PLATE RESISTANCE (APRROX)

    0.35 Mohm

    ClassA | PLATE RESISTANCE (APRROX) 0.35 MEGOHM

  • GRID #

    30000 ohm

    ClassA | GRID #1 IMPEDANCE AT qO MC 30000 OHMS C

Data set 05

1967 Mullard Receiving and Amplifying Valves

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Ci n

    10 pF

    Published in approved EF184 target datasheet entry; Section1

  • Co ut

    3 pF

    Published in approved EF184 target datasheet entry; Section1

  • Cg l - g 2

    2.8 pF

    Published in approved EF184 target datasheet entry; Section1

  • P g2 max

    900 mW

    Published in approved EF184 target datasheet entry; Section1

  • T b u l b max

    180 °C

    Published in approved EF184 target datasheet entry; Section1

  • gm =2

    2 mA

    Published in approved EF184 target datasheet entry; Section1

Data set 06

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    200 V

    ClassA1;IF-Amplifier

  • Grid 2 voltage

    200 V

    ClassA1;IF-Amplifier

  • Grid 1 voltage

    -2.5 V

    ClassA1;IF-Amplifier

  • Plate current

    10 mA

    ClassA1;IF-Amplifier

  • Grid 2 current

    4.1 mA

    ClassA1;IF-Amplifier

  • Maximum no-current plate voltage

    550 V

    PlateCurrent=0

Characteristic

  • Grid-2-to-grid-1 amplification factor

    60

    ClassA1

  • Heater warm-up time

    11 s

    ControlledWarmUp

Data set 07

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater Voltage (ac/dc) 3.4 4.4

    6.3 V

    Published in approved XF184 target datasheet entry; Section1

  • Heater Current 0.6 0.45

    300 mA

    Published in approved XF184 target datasheet entry; Section1

  • Plate Supply Voltage B

    50 V

    Published in approved XF184 target datasheet entry; Section1

  • Plate Voltage

    250 V

    Published in approved XF184 target datasheet entry; Section1

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

    550 V

    Published in approved XF184 target datasheet entry; Section1

  • Grid-No.2 Voltage

    250 V

    Published in approved XF184 target datasheet entry; Section1

  • Cathode Current

    25 mA

    Published in approved XF184 target datasheet entry; Section1

  • Plate Dissipation

    2.5 W

    Published in approved XF184 target datasheet entry; Section1

  • Grid-No.2 Input

    0.9 W

    Published in approved XF184 target datasheet entry; Section1

  • Plate Voltage 190

    200 V

    Published in approved XF184 target datasheet entry; Section1

  • Grid-No.2 Voltage 190

    200 V

    Published in approved XF184 target datasheet entry; Section1

  • Grid-No. 1 Voltage —2.35

    -2.5 V

    Published in approved XF184 target datasheet entry; Section1

  • Grid-No.l-Circuit Resistance

    1 MΩ

    Published in approved XF184 target datasheet entry; Section1

Capacitance

  • Internal Shield

    10 pF

    Published in approved XF184 target datasheet entry; Section1

  • Internal Shield

    3 pF

    Published in approved XF184 target datasheet entry; Section1

Characteristic

  • Plate Resistance (Approx.) 0.35

    0.35 MΩ

    Published in approved XF184 target datasheet entry; Section1

  • Transconductance 15000

    15000 µS

    Published in approved XF184 target datasheet entry; Section1

  • Plate Current 10

    10 mA

    Published in approved XF184 target datasheet entry; Section1

  • Grid-No.2 Current 4.1

    -4.1 mA

    Published in approved XF184 target datasheet entry; Section1