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Voltage Pentode - Remote Cutoff (single) ·Pentode

3BZ6

Semi-remote-cutoff pentode designed for gain-controlled television video-IF amplifier stages. Its transfer characteristic permits effective AGC while maintaining the bandwidth required for television intermediate-frequency signals.

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

Description

Semiremote-cutoff pentode used in gain-controlled television video-IF amplifier stages.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
7CM
Socket code
B7G
Base pins
7
Nominal heater voltage
3.15 V
Nominal heater current
600 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

7CM - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1G1AG1 — Control Grid

EIA chart transcription; manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CM

PIN2KAK — Cathode

EIA chart transcription; manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CM

PIN3H—H — Heater

EIA chart transcription; manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CM

PIN4H—H — Heater

EIA chart transcription; manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CM

PIN5PAP — Plate (Anode)

EIA chart transcription; manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CM

PIN6G2AG2 — Screen Grid

EIA chart transcription; manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CM

PIN7G3AG3 — Suppressor GridGroup 7CM7

EIA chart transcription; manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CM

PIN7ISAIS — Internal ScreenGroup 7CM7

EIA chart transcription; manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7CM

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
600000 Ω
Transconductance
0.0061 S
Max plate voltage
300 V
Max screen voltage
150 V
Max plate dissipation
2.5 W
Max screen dissipation
0.5 W
Max cathode current
15 mA
Rectifier max heater-cathode voltage
200 V
Rectifier warm-up time
11 s

Published ratings/characteristics promoted where semantically applicable; supplemental values retained in parameter table.

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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    200 V

    ClassA

  • Screen-grid voltage

    150 V

    ClassA

  • Grid No.1 bias

    Rk=180 V

    ClassA

  • Plate current

    11 mA

    ClassA

  • Screen-grid current

    2.6 mA

    ClassA

  • Plate resistance

    600000 ohm

    ClassA

  • Transconductance

    6100 uS

    ClassA

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate Voltage

    200 V

    ClassA1

  • Screen Voltage

    150 V

    ClassA1

Characteristic

  • Plate Current

    11 mA

    ClassA1

Data set 03

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    125 V

  • Screen-grid voltage

    125 V

  • Cathode bias resistor

    56 Ohm

  • Plate current

    14 mA

  • Screen-grid current

    3.6 mA

Characteristics

  • Plate resistance

    260000 Ohm

  • Transconductance

    8000 uS

  • Control-grid cutoff voltage

    -19 V

Capacitance

  • Grid-to-plate capacitance

    0.015 pF

    Shielded

  • Input capacitance

    7 pF

    Shielded

  • Output capacitance

    3 pF

    Shielded

Data set 04

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Heater voltage

    3.15 V

    Published heater rating

  • Heater current

    600 mA

    Published heater rating

Other

  • Maximum plate voltage

    330 V

    Published limit

  • Maximum screen voltage

    250 V

    Published limit

  • Maximum plate dissipation

    1.8 W

    Published limit

  • Maximum screen dissipation

    0.7 W

    Published limit

  • Maximum cathode current

    15 mA

    Published limit

Data set 05

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Current — published value 1

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Current — published value 2

    600

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Current — published value 3

    0.04

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Voltage (ac or dc) at 0.600 A — published value 1

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Voltage (ac or dc) at 0.600 A — published value 2

    0.6 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Voltage (ac or dc) at 0.600 A — published value 3

    3.15 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Warm-up Time (Average)

    11

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Heater~athode Voltage — published value 1

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Heater~athode Voltage — published value 2

    0 V

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Current — published value 1

    0.6

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Current — published value 2

    0.04

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

Data set 06

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Peak Plate Current

    180 mA

    Published in approved 12BZ6 target entry; Section1

  • Heater Voltage (ac/dc) 3.15 4.2 6.3

    12.6 V

    Published in approved 12BZ6 target entry; Section1

  • Heater Current 0.6 0.45 0.3

    150 mA

    Published in approved 12BZ6 target entry; Section1

  • age)

    11 seconds

    Published in approved 12BZ6 target entry; Section1

  • Plate Voltage

    330 V

    Published in approved 12BZ6 target entry; Section1

  • Grid No.3 (Suppressor-Grid) Voltage, Positive value

    0 V

    Published in approved 12BZ6 target entry; Section1

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

    330 V

    Published in approved 12BZ6 target entry; Section1

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

    0 V

    Published in approved 12BZ6 target entry; Section1

  • Plate Dissipation

    2.3 W

    Published in approved 12BZ6 target entry; Section1

  • For grid-No. 2 voltages up to

    165 V

    Published in approved 12BZ6 target entry; Section1

  • For grid-No. 2 voltages up to 165 volts

    0.55 W

    Published in approved 12BZ6 target entry; Section1

  • For grid-No.2 voltages between 165 and

    330 V

    Published in approved 12BZ6 target entry; Section1

  • For fixed-bias operation

    0.25 MΩ

    Published in approved 12BZ6 target entry; Section1

  • For cathode-bias operation

    1 MΩ

    Published in approved 12BZ6 target entry; Section1

Characteristic

  • Plate Supply Voltage

    125 V

    Published in approved 12BZ6 target entry; Section1

  • Grid-No.2 Supply Voltage

    125 V

    Published in approved 12BZ6 target entry; Section1

  • Cathode-Bias Resistor

    56 Ω

    Published in approved 12BZ6 target entry; Section1

  • Plate Resistance (Approx.)

    0.26 MΩ

    Published in approved 12BZ6 target entry; Section1

  • Grid-No.l Voltage (Approx.) for transconductance of

    50 µS

    Published in approved 12BZ6 target entry; Section1

  • Grid-No.l Voltage (Approx.) for transconductance of 50 /imhos

    -3.6 V

    Published in approved 12BZ6 target entry; Section1

  • Grid-No.l Voltage (Approx.) for transconductance of

    700 µS

    Published in approved 12BZ6 target entry; Section1

  • Heater Voltage (ac/dc)

    6.3 V

    Published in approved 12BZ6 target entry; Section1

  • Heater Current

    150 mA

    Published in approved 12BZ6 target entry; Section1