6SU7GTY

Specially tested high-mu twin triode selected for low gas, low leakage, and close plate-current balance, intended for precision low-level amplifier applications.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 8BD
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 300 mA

Description

High-mu twin triode specially tested for low gas/leakage and plate-current balance.

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: 300 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

Plate resistance: 44000 Ω
Transconductance: 0.0016 S
Amplification factor: 70
Max plate voltage: 250 V
Max plate dissipation: 1 W

Published promoted fields populated from printed headings; identical repeated sections compressed.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 44000 Ω
Transconductance: 0.0016 S
Amplification factor: 70
Max plate voltage: 250 V
Max plate dissipation: 1 W

Second identical physical triode section; added to align 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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
250 V
ClassA; BothSections
Grid voltage
-2 V
ClassA; BothSections
Plate current
2.3 mA
ClassA; BothSections

Characteristics

Plate resistance
44000 ohm
ClassA
Transconductance
1600 uS
ClassA
Amplification factor
70
ClassA

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate Voltage
250 V
ClassA1;EachUnit

Characteristic

Plate Current
2.3 mA
ClassA1;EachUnit

Data set 03

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Plate voltage
250 V
ClassA;EachSection
Grid voltage
-2 V
ClassA;EachSection
Plate current
2.3 mA
ClassA;EachSection
Plate resistance
44000 ohm
ClassA;EachSection
Transconductance
1600 uS
ClassA;EachSection
Amplification factor
70
ClassA;EachSection