12SC7

Octal high-mu twin triode with a common cathode, intended for resistance-coupled voltage amplification and phase-inverter service in audio and general electronic equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 8S
Socket code: IO
Base pins: 8
Nominal heater: 12.6 V / 150 mA

Description

The 12SC7 is a DualTriode vacuum tube as described by the source datasheet.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 8S
Socket code: IO
Base pins: 8
Nominal heater voltage: 12.6 V
Nominal heater current: 150 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

8S - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1SH	A	SH — Internal Shield EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8S
PIN22P	B	P — Plate (Anode) EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8S
PIN32G1	B	G1 — Control Grid EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8S
PIN41G1	A	G1 — Control Grid EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8S
PIN51P	A	P — Plate (Anode) EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8S
PIN6K	A	K — Cathode EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8S
PIN7H	—	H — Heater EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8S
PIN8H	—	H — Heater EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8S

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 53000 Ω
Transconductance: 0.001325 S
Amplification factor: 70
Max plate voltage: 250 V

Promoted from printed maximum/characteristic columns; additional published values retained in TUBE_SECTION_PARAMETER.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 53000 Ω
Transconductance: 0.001325 S
Amplification factor: 70
Max plate voltage: 250 V

Physical triode row restored under current one-row-per-physical-section policy.

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

Triode

Other

Plate voltage
250 V
ClassA;EachSection
Control-grid voltage
-2 V
ClassA;EachSection
Plate current
2 mA
ClassA;EachSection

Characteristic

Plate resistance
53000 Ω
EachSection
Transconductance
1325 µS
EachSection
Amplification factor
70
EachSection