6SL7 — Small Signal Triode, Octal | Tubeofile

6SL7

Small Signal Triode — Octal

RCA

Known Equivalents & Substitutes

6SL7GT6SL7GTY6SL7A6SU76SU7GTY6SU7WGT12SL7GT5691611361886SL7WA6SL7WGTECC35E438CV569CV1984CV1985VT-22914F72C526N9S6N9P6H9C33S29B653A/154M41MHF

Similar Tubes (Not Drop-In Compatible)

12AT7

Medium-mu dual triode (mu=60) on Noval base; similar gain range

High-mu dual triode (mu=100) but Noval base; higher gain, lower current

High-mu dual triode (mu=70) on Octal base but different pinout (shared cathode)

Same Octal dual triode pinout but medium-mu (mu=20) vs high-mu (mu=70)

Same electrical characteristics (mu=70, ra=44k) but Loctal base instead of Octal

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)300V

Anode Dissipation (max)Anode Dissipation (max, per section)1W

Cathode Current (max)Cathode Current (max)4mA

Heater-to-Cathode Voltage (max)Heater-to-Cathode Voltage (max)90V

Typical Operating

Notes

Developed by RCA circa 1941 as a high-mu companion to the 6SN7 medium-mu dual triode.
The 5691 is a premium long-life version rated for 10,000 hours minimum with matched sections.
The 6113 is a ruggedized military version of the 6SL7GT.
Widely used as a voltage amplifier, phase splitter, and driver stage in hi-fi amplifiers and guitar amplifiers.
The 12SL7GT is the 12.6V heater series-string version.

Pin Layout — Octal