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.

6AS7GC Triode Vacuum Tube

Also known as 6AS7G · 6080 family — verify operating point and dissipation before substitution

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

Dual triodeHeater 6.3 V · 2.5 AOctal2 sectionsGE 1950

Plate dissipation: 13W
Max plate voltage: 250V
Transconductance: 7mA/V

6AS7GC

Pd check: failDissipation check failed — the Koren model exceeds this tube's Pa-max at the audit probe point. Calculator results for this tube are under review.

Characteristics

Datasheet values, once each. Every value cites its sheet.

HeaterIndirectly heated

Specifications of 6AS7GC — Heater
Heater voltageVh	6.3 V
Heater currentIh	2.5 A

Limiting valuesDatasheet maximum ratings — not to be exceeded

Specifications of 6AS7GC — Limiting values
Plate voltageVa max	250 V
Plate dissipationPa max	13 W

Mechanical

Specifications of 6AS7GC — Mechanical
Base	Octal
Rarity	Common
Pinout

Small signalDatasheet parameters at the reference operating point — not limits

Specifications of 6AS7GC — Small signal
Transconductance	7 mA/V
Plate resistance	280 Ω
Amplification factor	2

Capacitances

Specifications of 6AS7GC — Capacitances
Grid–cathode	6.8 pF
Grid–plate	10.5 pF
Plate–cathode	2.3 pF

Charactereditorial reading, not a measurement

Specifications of 6AS7GC — Character
Gain	2%
Power	33%
Drive	100%
Linearity	95%

datasheet cited · model or editorial reading · catalogue value, no citation attached yet · nothing invented

Using this tube

Applications

SET output
Push-pull output
Headphone output
Phase splitter

Generic triode otl / regulator stage

Headphone amp

Replace or compare

Sources

By Jean-Michel Falligan DevergneReviewed May 29, 2026Source : 6AS7GC / 6AS7 family datasheet — dual power triode; corrected sections=2Active model : Norman Koren

Manufacturer datasheets

3 manufacturer datasheets cross-checked for 6AS7GC3 verified

6AS7GC DatasheetLocal mirror · PDF

SPICE models

Revision and verification status

Source: 6AS7GC / 6AS7 family datasheet — dual power triode; corrected sections=2
Reviewed: 2026-05-29
Status: DataModelCalc
Model: Norman Koren

Context

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.

History

Introduced: 1950
Manufacturer: GE
Era: Golden Age

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