6SN7EH

Modern medium-mu twin triode with two matched sections for low-frequency voltage amplification. Conventional 6SN7 electrical characteristics suit audio voltage-amplifier, driver, phase-splitter, and related small-signal applications rather than true power-output service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 8BD
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 600 mA

Description

Twin triode with equipotential cathodes for low-frequency voltage amplification.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 8BD
Socket code: IO
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

8BD - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN12G1	B	G1 — Control Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN22P	B	P — Plate (Anode) EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN32K	B	K — Cathode EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN41G1	A	G1 — Control Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN51P	A	P — Plate (Anode) EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN61K	A	K — Cathode EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN7H	—	H — Heater EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN8H	—	H — Heater EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0026 S
Amplification factor: 20
Max plate voltage: 450 V
Max plate dissipation: 5 W
Max cathode current: 20 mA

Representative section for two electrically identical triodes.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0026 S
Amplification factor: 20
Max plate voltage: 450 V
Max plate dissipation: 5 W
Max cathode current: 20 mA

Second identical physical section; added to align physical rows with SectionCount.

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

2026 Electro Harmonix Gold

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Plate Current
7 to 13 mA
Plate 250 V; Grid -8 V