What is the 6AS7GC vacuum tube?

The 6AS7GC is a triode vacuum tube designed for otl / regulator applications. Ruggedized version..

What is a 6AS7GC substitute or equivalent?

Direct equivalents to the 6AS7GC include 6AS7G / 6080 family — verify operating point and dissipation before substitution. These share the same pinout and operating envelope, so they can usually be swapped without circuit changes — though batch-to-batch variations between manufacturers (NOS vs current production) may shift the sonic character noticeably.

What are the key specifications of the 6AS7GC?

Amplification factor μ ≈ 2, transconductance gm ≈ 7 mA/V, plate resistance rp ≈ 280 Ω, max plate voltage 250 V, max plate dissipation 13 W, heater 6.3 V / 2.5 A.

Is the 6AS7GC still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the 6AS7GC as Common availability. NOS (new-old-stock) examples from RCA, Mullard, Tung-Sol, GE, Sylvania and Telefunken trade among collectors; modern production where it exists comes mostly from JJ Electronic, Electro-Harmonix, Tung-Sol (New Sensor), Genalex, and a handful of small-batch makers.

What does the 6AS7GC sound like?

Ruggedized version.. Sonic character also depends heavily on the circuit operating point, the surrounding tubes in the stage, and the output transformer when present — use the interactive loadline calculator on this page to explore the trade-offs.

By Jean-Michel Falligan Devergne · Reviewed May 29, 2026

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6AS7GC Triode Vacuum Tube

Dual triode6.3V / 2.5AOctalSPICE

Source6AS7GC / 6AS7 family datasheet — dual power triode; corrected sections=2Reviewed2026-05-29StatusDataModelCalcModelNorman KorenPDF

High-power directly-heated triode for single-ended amplification

Datasheet ↗SPICE

6AS7GC — GE — triode vacuum tube — (1950)

280Ω

7.0mA/V

6.8pF

10.5pF

2.30pF

GAIN2%

POWER33%

DRIVE100%

LINEARITY95%

SPECIFICATIONS

Heater6.3 V · 2.5 A

Max Plate Voltage250 V

Pa max13 W

Gain Factor2

gm7 mA/V

rp280 Ω

Inter-electrode capacitances

Cgk6.8 pF

Cgp10.5 pF

Cpk2.3 pF

PinoutOctal

Era1950

RarityCommon

HEATER6.3V / 2.5A

MAX PLATE250V / 13W

BASEoctal

SECTIONS2 (dual)

Source datasheets

3 manufacturer datasheets cross-checked for 6AS7GC

3 verified

TYPICAL OPERATING POINT

Va225V

Ia36.07mA

Vg-116.7184107045V

Pd8.12W

RL600Ω

Av0dB

EXECUTIVE SUMMARY

The 6AS7GC is a dual indirectly-heated triode from GE, introduced around 1950. It provides a gain factor (μ) of 2 with 280Ω plate resistance. Commonly used in otl / regulator applications. Ruggedized version.

APPLICATIONS

SET outputPush-pull outputHeadphone outputPhase splitter

Generic triode otl / regulator stage

• Headphone amp

HISTORY

Introduced1950ManufacturerGE

Golden Age

6AS7GC Datasheet

Local mirror · PDF

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METRIX TESTER

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