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Voltage - Triode (single high frequency) ·Triode

2HM5

Miniature triode used as an RF amplifier in VHF color and black-and-white television tuners.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
7GM
Socket code
B7G
Base pins
7
Nominal heater
2.4 V / 600 mA

Description

Miniature triode used as an RF amplifier in VHF color and black-and-white 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
7GM
Socket code
B7G
Base pins
7
Nominal heater voltage
2.4 V
Nominal heater current
600 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

7GM - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1G1AG1 — Control Grid

EIA transcription; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7GM

PIN2KAK — Cathode

EIA transcription; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7GM

PIN3H—H — Heater

EIA transcription; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7GM

PIN4H—H — Heater

EIA transcription; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7GM

PIN5PAP — Plate (Anode)

EIA transcription; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7GM

PIN6ISAIS — Internal Screen

EIA transcription; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7GM

PIN7KAK — Cathode

EIA transcription; independent manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7GM

Section ratings

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
5200 Ω
Transconductance
0.018 S
Amplification factor
82
Max plate voltage
200 V
Max plate dissipation
2.2 W
Max cathode current
20 mA

Published ratings and characteristics promoted where clearly applicable; additional source values retained as section parameters.

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

1947 Westinghouse

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Heater or filament voltage

    2.4 V

    Published nominal/representative value

  • Heater or filament current

    600 mA

    Published nominal/representative value

  • Transconductance

    18000 µS

    Published

  • Amplification factor

    82

    Published/promoted value

  • Transconductance

    18000 µS

    120 V operating point

  • Amplification factor

    82

    120 V operating point

  • Noise figure

    4 dB

    200 MHz; optimized grounded-cathode stage

Other

  • Maximum plate dissipation

    2.2 W

    Published

  • Typical plate voltage

    120 V

    Published condition

  • Typical plate current

    15 mA

    120 V operating point

Data set 02

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate voltage

    135 V

  • Grid voltage

    -1 V

  • Plate current

    12.5 mA

Characteristics

  • Transconductance

    14500 uS

  • Amplification factor

    78 ratio

  • Hot input resistance

    1000 Ohm

Data set 03

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater Voltage

    2.4 V

  • Heater Current

    600 mA

  • ControlledWarmupHeater

    1 boolean

  • Heater Warmup Time

    11 s

  • Plate Voltage

    135 V

  • Grid Voltage

    -1 V

  • Plate Current

    12.5 mA

  • Plate Resistance

    5400 ohm

  • Transconductance

    14500 uS

  • Amplification Factor

    78

  • GridCutoffBias

    -5.1 V

  • Grid To Plate Capacitance

    0.34 pF

  • Input Capacitance

    4.5 pF

  • Output Capacitance

    3 pF

  • Noise Figure

    4.2 dB

    ~200MHz optimized amplifier

Other

  • HeaterCathodeVoltageMaximum

    100 V

Data set 04

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater Voltage (ac/dc) 2.0 2.7 4.0

    6.3 V

    Published in approved 2HM5 target datasheet entry; Section1

  • Heater Current 0.6 0.45 0.3

    180 mA

    Published in approved 2HM5 target datasheet entry; Section1

  • DC Plate Voltage

    220 V

    Published in approved 2HM5 target datasheet entry; Section1

  • DC Plate Supply Voltage

    600 V

    Published in approved 2HM5 target datasheet entry; Section1

  • Grid Voltage

    -50 V

    Published in approved 2HM5 target datasheet entry; Section1

  • Cathode Current

    22 mA

    Published in approved 2HM5 target datasheet entry; Section1

  • Plate Dissipation

    2.6 W

    Published in approved 2HM5 target datasheet entry; Section1

  • DC Plate Supply Voltage 135 135 135

    135 V

    Published in approved 2HM5 target datasheet entry; Section1

  • Plate-Load Resistor 1000

    5600 Ω

    Published in approved 2HM5 target datasheet entry; Section1

  • Internal-Shield Voltage 0 0 0

    0 V

    Published in approved 2HM5 target datasheet entry; Section1

  • DC Grid Voltage —1

    -2.7 V

    Published in approved 2HM5 target datasheet entry; Section1

  • Cathode-Bias Resistor 0

    87 Ω

    Published in approved 2HM5 target datasheet entry; Section1

  • Transconductance 14500 1500 20000

    14500 µS

    Published in approved 2HM5 target datasheet entry; Section1

  • Plate Current 11.5 19

    11.5 mA

    Published in approved 2HM5 target datasheet entry; Section1

  • DC Grid Current

    10 mA

    Published in approved 2HM5 target datasheet entry; Section1

  • transconductance —5.3

    -8.1 V

    Published in approved 2HM5 target datasheet entry; Section1

  • Heater Voltage (ac/dc) '2.4 3 4.2

    6.3 V

    Published in approved 2HM5 target datasheet entry; Section1

  • Heater Current 0.6 0.45 0.3

    200 mA

    Published in approved 2HM5 target datasheet entry; Section1

  • Heater Warm-up Time (Average) .11 11

    11 seconds

    Published in approved 2HM5 target datasheet entry; Section1

  • Plate Voltage

    200 V

    Published in approved 2HM5 target datasheet entry; Section1

  • Grid Voltage, Negative-bias Value

    50 V

    Published in approved 2HM5 target datasheet entry; Section1

  • Plate Dissipation

    2.5 W

    Published in approved 2HM5 target datasheet entry; Section1

  • Plate Voltage

    135 V

    Published in approved 2HM5 target datasheet entry; Section1

  • Grid Voltage

    -1 V

    Published in approved 2HM5 target datasheet entry; Section1

  • Grid-Circuit Resistance, for cathode-bias operation

    1 MΩ

    Published in approved 2HM5 target datasheet entry; Section1

  • ** Measured at

    200 MHz

    Published in approved 2HM5 target datasheet entry; Section1

  • # For a neutralized triode amplifier at a frequency of

    200 MHz

    Published in approved 2HM5 target datasheet entry; Section1

Capacitance

  • Grid to Plate

    0.36 pF

    Published in approved 2HM5 target datasheet entry; Section1

  • Grid to Cathode, Heater, Internal Shield, and External Shield

    4.3 pF

    Published in approved 2HM5 target datasheet entry; Section1

  • , Shield

    0.08 pF

    Published in approved 2HM5 target datasheet entry; Section1

  • Cathode to Plate

    2.9 pF

    Published in approved 2HM5 target datasheet entry; Section1

  • Cathode to Heater, Grid, Internal Shield, and External Shield

    3.1 pF

    Published in approved 2HM5 target datasheet entry; Section1

  • Heater to Cathode

    2.3 pF

    Published in approved 2HM5 target datasheet entry; Section1

  • Grid to Plate

    0.52 pF

    Published in approved 2HM5 target datasheet entry; Section1

  • Grid to Cathode, Heater, and Internal Shield

    5 pF

    Published in approved 2HM5 target datasheet entry; Section1

  • Plate to Cathode, Heater, and Internal Shield

    3.5 pF

    Published in approved 2HM5 target datasheet entry; Section1

  • Heater to Cathode

    2.5 pF

    Published in approved 2HM5 target datasheet entry; Section1

Characteristic

  • Plate Resistance

    5400 Ω

    Published in approved 2HM5 target datasheet entry; Section1

  • Transconductance

    15000 µS

    Published in approved 2HM5 target datasheet entry; Section1

  • Plate Current

    11.5 mA

    Published in approved 2HM5 target datasheet entry; Section1

  • Input Resistance**

    275 Ω

    Published in approved 2HM5 target datasheet entry; Section1

  • Input Capacitance**

    11.2 pF

    Published in approved 2HM5 target datasheet entry; Section1

  • Grid Voltage (Approx.) for transconductance of

    150 µS

    Published in approved 2HM5 target datasheet entry; Section1

  • Grid Voltage (Approx.) for transconductance of 150 /imhos

    -4.2 V

    Published in approved 2HM5 target datasheet entry; Section1

  • Grid Voltage (Approx.) for transconductance of 1500 ftmhos

    -2.5 V

    Published in approved 2HM5 target datasheet entry; Section1