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Voltage Pentode - Remote Cutoff (single) ·Pentode

6K7

Remote-cutoff RF/IF pentode designed for receiver front-end and intermediate-frequency stages. Its variable-mu characteristic permits effective automatic gain control across a wide range of received signal strengths.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
7R
Socket code
IO
Base pins
8
Nominal heater
6.3 V / 300 mA

Description

Remote-cutoff RF/IF amplifier pentode for receiver front-end and intermediate-frequency stages.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
7R
Socket code
IO
Base pins
8
Nominal heater voltage
6.3 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

7R - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1SHASH — Internal Shield

EIA chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7R

PIN2H—H — Heater

EIA chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7R

PIN3PAP — Plate (Anode)

EIA chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7R

PIN4G2AG2 — Screen Grid

EIA chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7R

PIN5G3AG3 — Suppressor Grid

EIA chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7R

PIN7H—H — Heater

EIA chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7R

PIN8KAK — Cathode

EIA chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7R

CAP1G1AG1 — Control Grid

EIA chart transcription; independent manufacturer verification pending

Unverified

EIA Base Connections, printed page 128, 7R

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
600000 Ω
Transconductance
0.00165 S
Amplification factor
990
Max plate voltage
300 V
Max screen voltage
140 V
Max plate dissipation
2.75 W
Max screen dissipation
0.35 W

Values promoted from the complete filename-matched Russian entry only.

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

1935 RCA All Metal Radio Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    250 V

  • Screen voltage

    125 V

  • Grid-plate capacitance

    0.005 pF

Characteristic

  • Plate current

    7 mA

    Plate250V;Screen100V

  • Screen current

    1.7 mA

    Plate250V;Screen100V

  • Grid voltage for mutual conductance 2 uS

    -42.5 V

    Plate250V;Screen100V

  • Input capacitance

    7 pF

  • Output capacitance

    12 pF

Data set 02

1937 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Maximum plate voltage

    250 V

    Published datasheet rating

  • Maximum screen voltage

    125 V

    Published datasheet rating

  • Plate voltage

    250 V

    ClassA

  • Screen voltage

    125 V

    ClassA

  • Screen current

    2.6 mA

    ClassA

Characteristic

  • Plate resistance

    600000 ohm

    Published datasheet characteristic

  • Transconductance

    1650 µS

    Published datasheet characteristic

  • Heater voltage

    6.3 V

    Published heater rating

  • Heater current

    300 mA

    Published heater rating

Data set 03

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater voltage

    6.3 V

    Published nominal value

  • Heater current

    300 mA

    Published nominal value

  • Transconductance

    1650 µS

    Published operating characteristic

  • Amplification factor

    990

    Published operating characteristic

  • Grid voltage for 2 µS transconductance

    -52.5 V

    Remote-cutoff control characteristic

Data set 04

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Plate Resistance

    600000 ohm

  • Transconductance

    1650 µS

  • Amplification Factor

    990

Other

  • Maximum Plate Voltage

    300 V

  • Maximum Screen Voltage

    125 V

  • Maximum Plate Dissipation

    2.75 W

  • Maximum Screen Dissipation

    0.35 W

  • Plate Voltage

    250 V

    ClassA

  • Screen Voltage

    125 V

    ClassA

  • Plate Current

    10.5 mA

    ClassA

Data set 05

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Maximum plate voltage

    300 V

    Published handbook rating

  • Maximum screen voltage

    150 V

    Published handbook rating

  • Plate voltage

    250 V

    ClassA

  • Screen voltage

    125 V

    ClassA

  • Control-grid bias

    3 V

    ClassA

  • Plate current

    10.5 mA

    ClassA

  • Screen current

    2.6 mA

    ClassA

Characteristic

  • Plate resistance

    600000 ohm

    Published handbook characteristic

  • Transconductance

    1650 µS

    Published handbook characteristic

  • Heater voltage

    6.3 V

    Published heater rating

  • Heater current

    300 mA

    Published heater rating

Capacitance

  • Input capacitance

    7 pF

    Published capacitance column

  • Output capacitance

    12 pF

    Published capacitance column

  • Grid-to-plate capacitance

    0.005 pF

    Published capacitance column

Data set 06

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate Voltage

    250 V

    Average characteristics

  • Screen Voltage

    125 V

    Average characteristics

Characteristic

  • Plate Current

    10.5 mA

    Average characteristics

  • Screen Current

    2.6 mA

    Average characteristics

Data set 07

1981 Russian Tubes Katsnelson and Larionov

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Plate current

    7 mA

    Translated from Russian source; filename-matched entry only

  • Transconductance

    1.45 mA/V

    Translated from Russian source; filename-matched entry only

  • Plate resistance

    1 MOhm

    Translated from Russian source; filename-matched entry only

  • Maximum plate voltage

    330 V

    Translated from Russian source; filename-matched entry only

  • Maximum plate dissipation

    8 W

    Translated from Russian source; filename-matched entry only

  • Service life minimum

    2000 h

    Translated from Russian source; filename-matched entry only