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Voltage - Triode (single high frequency) ·Triode

3ER5

High-mu frame-grid triode used as an RF amplifier in VHF television tuners.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
7FP
Socket code
B7G
Base pins
7
Nominal heater
2.8 V / 450 mA

Description

High-mu frame-grid triode used as an RF amplifier in VHF television tuners.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
7FP
Socket code
B7G
Base pins
7
Nominal heater voltage
2.8 V
Nominal heater current
450 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

7FP - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1KAK — Cathode

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7FP

PIN2G1AG1 — Control Grid

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7FP

PIN3H—H — Heater

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7FP

PIN4H—H — Heater

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7FP

PIN5PAP — Plate (Anode)

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7FP

PIN6ISAIS — Internal Screen

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7FP

PIN7KAK — Cathode

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7FP

Section ratings

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
8000 Ω
Transconductance
0.0105 S
Amplification factor
80
Max plate voltage
550 V
Max plate dissipation
2.2 W
Max cathode current
20 mA

Promoted only where the locked schema has a direct semantic match; additional published receiving-tube, pulse, rectifier, capacitance, and transmitting-tube values are 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

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate voltage

    200 V

    RFAmplifier

  • Control-grid voltage

    -1.2 V

    RFAmplifier

  • Plate current

    10 mA

    RFAmplifier

Characteristic

  • Transconductance

    10500 µS

    Section1

  • Amplification factor

    80

    Section1

Data set 02

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

  • Grid-to-heater capacitance maximum

    0.28 pF

    Section1

  • Cathode-to-heater capacitance

    2.8 pF

    Section1

Other

  • Zero-current plate voltage maximum

    550 V

    Section1

  • Plate voltage

    200 V

    VHFRFAmplifier

  • Plate current

    10 mA

    VHFRFAmplifier

  • Application

    Remote-cutoff frame-grid VHF tuner amplifier

    Section1

Characteristic

  • Transconductance

    10500 µS

    Section1

  • Amplification factor

    80

    Section1

Data set 03

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater Voltage (ac/dc) 2.8

    6.3 V

    Published in approved 6ER5 target entry; Section1

  • Heater Current 0.45

    180 mA

    Published in approved 6ER5 target entry; Section1

  • Plate Voltage

    250 V

    Published in approved 6ER5 target entry; Section1

  • Grid Voltage, Negative-bias value

    50 V

    Published in approved 6ER5 target entry; Section1

  • Cathode Current

    20 mA

    Published in approved 6ER5 target entry; Section1

  • Plate Dissipation

    2.2 W

    Published in approved 6ER5 target entry; Section1

  • Grid Voltage

    -1.2 V

    Published in approved 6ER5 target entry; Section1

  • Plate Resistance (Approx.)

    8000 Ω

    Published in approved 6ER5 target entry; Section1

  • Transconductance

    10500 µS

    Published in approved 6ER5 target entry; Section1

  • Plate Current

    10 mA

    Published in approved 6ER5 target entry; Section1

  • Grid Voltage (Approx.) for transconductance of 500 /xmhos

    -3.8 V

    Published in approved 6ER5 target entry; Section1

Capacitance

  • Grid to Plate 0.38

    0.36 pF

    Published in approved 6ER5 target entry; Section1

  • Grid to Cathode, Heater, and Internal Shield . 4.4

    4.4 pF

    Published in approved 6ER5 target entry; Section1

  • Plate to Cathode, Heater, and Internal Shield . . 3

    4 pF

    Published in approved 6ER5 target entry; Section1

Characteristic

  • Grid Voltage (Approx.) for transconductance of

    100 µS

    Published in approved 6ER5 target entry; Section1

  • Grid Voltage (Approx.) for transconductance of 100 /imhos

    -5.6 V

    Published in approved 6ER5 target entry; Section1