What is the 6W6GT vacuum tube?

The 6W6GT is a tetrode vacuum tube designed for power applications. Smooth delivery..

What is a 6W6GT substitute or equivalent?

Direct equivalents to the 6W6GT include None. 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 6W6GT?

Amplification factor μ ≈ 6, transconductance gm ≈ 8 mA/V, plate resistance rp ≈ 13.0 kΩ, max plate voltage 300 V, max plate dissipation 10 W, heater 6.3 V / 1.2 A.

Is the 6W6GT still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the 6W6GT 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 6W6GT sound like?

Smooth delivery.. 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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6W6GT Tetrode Vacuum Tube

Tetrode6.3V / 1.2AOctal

Sourceaudit-us_b (CLEAN — matches canonical datasheet)Reviewed2026-05-29StatusDataModelCalcModelunder reviewPDF

Beam power tetrode rated at 10W for high-power output stages

Datasheet ↗

6W6GT — RCA — tetrode vacuum tube — (1939)

13.0kΩ

8.0mA/V

15.0pF

0.8pF

9.00pF

GAIN6%

POWER25%

DRIVE87%

LINEARITY95%

SPECIFICATIONS

Heater6.3 V · 1.2 A

Max Plate Voltage300 V

Pa max10 W

Gain Factor6

gm8 mA/V

rp13.0 kΩ

Inter-electrode capacitances

Cgk15 pF

Cgp0.8 pF

Cpk9 pF

PinoutOctal

Era1939

RarityCommon

HEATER6.3V / 1.2A

MAX PLATE300V / 10W

BASEoctal

Source datasheets

4 manufacturer datasheets cross-checked for 6W6GT

4 verified

EXECUTIVE SUMMARY

The 6W6GT is a indirectly-heated beam tetrode from RCA, introduced around 1939. It provides a gain factor (μ) of 6 with 13.0kΩ plate resistance. Commonly used in power applications. Smooth delivery.

HISTORY

Introduced1939ManufacturerRCA

Pre-War

6W6GT Datasheet

Local mirror · PDF

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METRIX TESTER

Test this tube on a Metrix

SPICE model not yet available. Loadline calculator requires calibrated Koren parameters.

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