6SL7

High-mu double triode intended for audio-frequency voltage amplification, providing two independent sections for high-gain signal-amplifier applications.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

High-mu dual triode for 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: -
Socket code: IO
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

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: 300 V
Max plate dissipation: 1 W
Max cathode current: 8 mA

Representative section for two electrically identical sections.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 44000 Ω
Transconductance: 0.0016 S
Amplification factor: 70
Max plate voltage: 300 V
Max plate dissipation: 1 W
Max cathode current: 8 mA

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

1953 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Heater or filament voltage
6.3 V
Published nominal value
Heater or filament current
300 mA
Published nominal value
Transconductance
1600 µS
Published operating characteristic