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Voltage Pentode - Sharp Cutoff (single) ·Pentode

7C7

Sharp-cutoff pentode designed for RF, IF, wide-band, or high-frequency voltage-amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 8V
Socket code: B8G
Base pins: 8
Nominal heater: 6.3 V / 150 mA

Description

The 7C7 is a sharp-cutoff general-purpose pentode amplifier using lock-in construction for RF, IF and voltage-amplifier applications.

Socket description

Loctal 8-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 8V
Socket code: B8G
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 150 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

8V - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1H	—	H — Heater EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8V
PIN2P	A	P — Plate (Anode) EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8V
PIN3G2	A	G2 — Screen Grid EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8V
PIN4G3	A	G3 — Suppressor Grid EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8V
PIN5IS	A	IS — Internal Screen EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 129, 8V
PIN6G1	A	G1 — Control Grid EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 129, 8V
PIN7K	A	K — Cathode EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 129, 8V
PIN8H	—	H — Heater EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 129, 8V

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 2000000 Ω
Transconductance: 0.0013 S
Max plate voltage: 300 V
Max screen voltage: 100 V
Max plate dissipation: 1 W
Max screen dissipation: 0.1 W
Rectifier max heater-cathode voltage: 90 V

Published promoted fields populated by semantic heading; identical repeated physical sections compressed.

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

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Plate Voltage
250 V
Plate Current
2 mA
Screen Voltage
100 V
Screen Current
0.5 mA
Control Grid Voltage
-3 V
Cathode Bias Resistor
1200 ohm
Plate Resistance
2 Mohm
Transconductance
1300 µS
Cutoff Grid Voltage
-7 V

Data set 02

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

HeaterVoltageNominal
7 V
Nominal
HeaterCurrentNominal
160 mA
Nominal
Plate Voltage
250 V
ClassA
Screen Voltage
100 V
ClassA

Data set 03

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

Input capacitance
5.5 pF
Section1
Output capacitance
6.5 pF
Section1
Grid-to-plate capacitance
0.007 pF
Section1

Other

Typical plate voltage
250 V
ClassA
Typical screen voltage
100 V
ClassA
Typical grid voltage
-3 V
ClassA
Typical plate current
2 mA
ClassA
Typical screen current
0.5 mA
ClassA

Characteristic

Plate resistance
2000000 Ohm
Section1
Transconductance
1300 uS
Section1

Data set 04

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Transconductance
2275 uS
PlateVoltage=100V

Data set 05

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate_voltage
250 V
ClassA
Screen_voltage
100 V
ClassA

Characteristic

Plate_current
7 mA
ClassA
Transconductance
2275 uS
ClassA
Plate_resistance
400000 ohm
ClassA

Capacitance

Grid-to-plate capacitance
0.005 pF
Input capacitance
6.5 pF
Output capacitance
7 pF