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Voltage Pentode - Sharp Cutoff (single) ·Pentode

LF184

Sharp-cutoff high-transconductance pentode designed as an IF amplifier in color and black-and-white television receivers. Its substantial transconductance supports wideband fixed-gain television intermediate-frequency amplification.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
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
-
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

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
0.015 S
Max plate voltage
250 V
Max screen voltage
250 V
Max plate dissipation
2.5 W
Max screen dissipation
0.9 W
Max cathode current
25 mA

Promoted from published ratings/characteristics where directly applicable; additional published values retained in TUBE_SECTION_PARAMETER.

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

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 02

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