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Voltage Tetrode ·Tetrode

2CY5

VHF tetrode designed as the RF amplifier in television tuners, providing high-frequency gain with controlled cutoff characteristics for front-end receiver service.

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

Description

Sharp-cutoff tetrode 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
7EW
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

7EW - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1G1AG1 — Control Grid

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7EW

PIN2ISAIS — Internal ScreenGroup 7EW2

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7EW

PIN2KAK — CathodeGroup 7EW2

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7EW

PIN3H—H — Heater

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7EW

PIN4H—H — Heater

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7EW

PIN5PAP — Plate (Anode)

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7EW

PIN6G2AG2 — Screen Grid

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7EW

PIN7ISAIS — Internal ScreenGroup 7EW7

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7EW

PIN7KAK — CathodeGroup 7EW7

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 129, 7EW

Section ratings

1 physical section, each with unique specifications.

Section 1

Tetrode

X-ray radiationInterelectrode capacitances
Plate resistance
125000 Ω
Transconductance
0.008 S
Max plate voltage
180 V
Max screen voltage
180 V
Max plate dissipation
2 W
Max screen dissipation
0.5 W
Max cathode current
20 mA

Reference/heater-variant sheet; no unprinted electrical ratings were imported from the referenced 6-series datasheet.

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Capacitance

  • Grid To Plate Capacitance

    0.03 pF

  • Input Capacitance

    4.5 pF

  • Output Capacitance

    3 pF

Data set 02

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

  • Plate voltage

    125 V

  • Screen-grid voltage

    80 V

  • Grid 1 voltage

    -1 V

  • Plate current

    10 mA

  • Screen-grid current

    1.4 mA

Characteristics

  • Plate resistance

    125000 Ohm

  • Transconductance

    8000 uS

  • Control-grid cutoff voltage

    -6 V

Capacitance

  • Grid-to-plate capacitance

    0.03 pF

    Shielded

  • Input capacitance

    4.4 pF

    Shielded

  • Output capacitance

    2.8 pF

    Shielded

Data set 03

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristics

  • Heater Voltage

    2.4 V

  • Heater Current

    600 mA

  • Grid-Plate Capacitance

    0.03 pF

    Maximum; Shielded

  • Input Capacitance

    4.4 pF

    Shielded

  • Output Capacitance

    2.8 pF

    Shielded

Other

  • Maximum Plate Voltage

    180 V

  • Maximum Screen Supply Voltage

    180 V

  • Maximum Plate Dissipation

    2 W

  • Maximum Screen Dissipation

    0.5 W

  • Maximum Cathode Current

    20 mA

  • Plate Voltage

    125 V

  • Screen Voltage

    80 V

  • Grid Voltage

    -1 V

  • Plate Current

    10 mA

  • Screen Current

    1.4 mA

Data set 04

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Capacitance

  • GRID #

    0.03 ΜΜF

    Capacitances | GRID #1 TO PLATE 0.03 µµf

Other

  • MAXIMUM CATHODE CURRENT

    20 mA

    Maximum Ratings | MAXIMUM CATHODE CURRENT 20 MA.

  • PLATE VOLTAGE

    125 V

    Typical Operating Conditions | PLATE VOLTAGE 125 voLTs

  • GRID #

    -1 V

    Typical Operating Conditions | GRID #1 VOLTAGE -1 VOLTS

  • PLATE RESISTANCE O

    1 Mohm

    Typical Operating Conditions | PLATE RESISTANCE O.1 MEGOHM

  • TRANSCONDUCTANCE

    0 ΜMHOS

    Typical Operating Conditions | TRANSCONDUCTANCE 8 000 µMHOS

  • GRID #

    1.5 mA

    Typical Operating Conditions | GRID #2 CURRENT 1.5 MA.

Data set 05

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

  • HeaterOrFilamentVoltageNominal

    2.4 V

  • HeaterOrFilamentCurrentNominal

    600 mA

Data set 06

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

  • Heater voltage

    2.4 V

  • Heater current

    600 mA

  • Heater warm-up time

    11 s

  • Plate voltage

    125 V

    ClassA

  • Screen voltage

    80 V

    ClassA

  • Grid voltage

    -1 V

    ClassA

  • Plate current

    10 mA

    ClassA

  • Screen current

    1.4 mA

    ClassA

  • Maximum plate voltage

    180 V

  • Maximum screen voltage

    180 V

  • Maximum plate dissipation

    2 W

Characteristic

  • Plate resistance

    125000 ohm

    ClassA

  • Transconductance

    8000 uS

    ClassA

Capacitance

  • Grid-to-plate capacitance

    0.03 pF

  • Input capacitance

    4.4 pF

  • Output capacitance

    2.74 pF

Data set 07

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

  • Heater Voltage (ac/dc) 2.4 2.9

    6.3 V

    Published in approved target datasheet entry

  • Heater Current 0.6 0.45

    200 mA

    Published in approved target datasheet entry

  • Heater Warm-up Time (Average) 11

    11 seconds

    Published in approved target datasheet entry

  • Plate Voltage

    180 V

    Published in approved target datasheet entry

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

    180 V

    Published in approved target datasheet entry

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

    0 V

    Published in approved target datasheet entry

  • Cathode Current

    20 mA

    Published in approved target datasheet entry

  • Plate Dissipation

    2 W

    Published in approved target datasheet entry

  • For grid-No.2 voltages up to

    90 V

    Published in approved target datasheet entry

  • For grid-No.2 voltages up to 90 volts

    0.5 W

    Published in approved target datasheet entry

  • For grid-No.2 voltages between 90 and

    180 V

    Published in approved target datasheet entry

  • Grid-No.l Voltage (Approx.) for plate current of 20 /lA

    -6 V

    Published in approved target datasheet entry

  • Grid-No.l-Circuit Resistance

    0.6 Mohm

    Published in approved target datasheet entry

Capacitance

  • Grid-No.l to Plate

    0.03 pF

    Published in approved target datasheet entry

  • Grid-No.l to Cathode, Heater, Grid No.2 and Internal Shield

    4.5 pF

    Published in approved target datasheet entry

  • Plate to Cathode, Heater, Grid No.2, and Internal Shield

    3 pF

    Published in approved target datasheet entry

Characteristic

  • Plate Voltage

    125 V

    Published in approved target datasheet entry

  • Plate Current

    10 mA

    Published in approved target datasheet entry

  • Grid-No.2 Current

    1.5 mA

    Published in approved target datasheet entry