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Voltage Pentode - Remote Cutoff (single) ·Pentode

6U7G

Remote-cutoff high-frequency pentode designed for RF amplification. Its variable-mu characteristic supports automatic gain control in receiver front-end stages across a broad range of signal levels.

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

Description

Remote-cutoff high-frequency pentode for RF amplification.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
7R
Socket code
-
Base pins
7
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
800000 Ω
Transconductance
0.0016 S
Max plate voltage
300 V
Max screen voltage
100 V
Max plate dissipation
2.25 W
Max screen dissipation
0.25 W

Remote-cutoff RF pentode section.

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

1937 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

  • Grid-to-plate capacitance

    0.007 pF

    Section1

  • Input capacitance

    4.8 pF

    Section1

  • Output capacitance

    9 pF

    Section1

Other

  • Plate voltage

    100 V

    ClassA

  • Screen voltage

    100 V

    ClassA

  • Grid bias

    -3 V

    ClassA

  • Plate current

    8 mA

    ClassA

  • Screen current

    2.2 mA

    ClassA

  • Plate voltage

    250 V

    ClassA

  • Screen voltage

    100 V

    ClassA

  • Plate current

    8.2 mA

    ClassA

  • Screen current

    2 mA

    ClassA

  • Plate voltage

    250 V

    Mixer

  • Screen voltage

    100 V

    Mixer

  • Grid bias

    -10 V

    Mixer

Characteristic

  • Plate resistance

    260000 Ω

    100VPlate

  • Transconductance

    1500 µS

    100VPlate

  • Plate resistance

    800000 Ω

    250VPlate

  • Transconductance

    1600 µS

    250VPlate

Data set 02

1938 Raytheon

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • EXTERMAL N Heater Voltage

    6.3 V

    EXTERMAL N Heater Voltage 6.3 volts

  • REQUIRED) I Heater Current

    300 mA

    REQUIRED) I Heater Current 0.3 ampere

  • Screen 100

    100 V

    Screen 100 100 volts

  • Plate Resistance .25

    0.8 MΩ

    Plate Resistance .25 0.8 megohms

  • Mutual Concéuctance 1500

    1500 µS

    Mutual Concéuctance 1500 1500 umhos

  • Ccenductance 2 Uphos

    -50 V

    Ccenductance 2 Uphos -50 -50 volts

  • swing

    1 V

    swing 1 volt less than grid bias.

Data set 03

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Heater Voltage

    6.3 V

  • Heater Current

    300 mA

Data set 04

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Heater Voltage

    6.3 V

  • Heater Current

    300 mA

  • Anode Voltage

    250 V

  • Transconductance

    1600 uS

  • ControlGridBiasForLowGm

    -50 V

Data set 05

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

  • Input capacitance

    9 pF

  • Grid-plate capacitance

    0.007 pF

Other

  • Plate voltage

    250 V

    ClassA

  • Screen voltage

    100 V

    ClassA

  • Grid voltage

    -3 V

    ClassA

  • Plate current

    8.2 mA

    ClassA

  • Screen current

    2 mA

    ClassA

Characteristics

  • Plate resistance

    800000 ohm

    ClassA

  • Transconductance

    1600 uS

    ClassA