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Voltage Pentode - Remote Cutoff (single) ·Pentode

6K7G

Glass-envelope version of the remote-cutoff 6K7 RF/IF amplifier pentode. It retains the variable-gain receiver function of the metal type while using conventional glass construction.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7R
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 300 mA

Description

Glass version of the remote-cutoff 6K7 RF/IF amplifier pentode.

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.

Terminal	Section	Connection	Evidence
PIN1SH	A	SH — 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
PIN3P	A	P — Plate (Anode) EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7R
PIN4G2	A	G2 — Screen Grid EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7R
PIN5G3	A	G3 — 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
PIN8K	A	K — Cathode EIA chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7R
CAP1G1	A	G1 — 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: 150 V
Max plate dissipation: 2.75 W
Max screen dissipation: 0.35 W

Published maximum ratings, characteristics, operating conditions and capacitances reviewed.

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

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 02

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Cutoff characteristic
Variable-mu

Data set 03

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

Data set 04

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Cutoff characteristic
Variable-mu

Application

Application
RF / IF amplification

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 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
100 V
Point1
Screen-grid voltage
100 V
Point1
Control-grid voltage
-1 V
Point1
Plate current
9.5 mA
Point1
Screen-grid current
2.7 mA
Point1
Plate voltage
250 V
Point3
Screen-grid voltage
125 V
Point3
Plate current
10.5 mA
Point3

Characteristics

Transconductance
1650 uS
Point1
Plate resistance
150000 Ohm
Point1
Control-grid cutoff voltage
-38 V
Point1
Transconductance
1650 uS
Point3
Plate resistance
600000 Ohm
Point3
Control-grid cutoff voltage
-52 V
Point3

Capacitance

Input capacitance
5 pF
6K7G
Input capacitance
4.6 pF
6K7GT
Output capacitance
12 pF
Grid-to-plate capacitance maximum
0.007 pF
6K7G
Grid-to-plate capacitance maximum
0.005 pF
6K7GT