What is the 6W6GT vacuum tube?

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

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.

6W6GT Tetrode Vacuum Tube

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

TetrodeHeater 6.3 V · 1.2 AOctalRCA 1939

Plate dissipation: 10W
Max plate voltage: 300V
Max screen voltage: 185V
Transconductance: 8mA/V

6W6GT

Characteristics

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

HeaterIndirectly heated

Specifications of 6W6GT — Heater
Heater voltageVh	6.3 V
Heater currentIh	1.2 A

Limiting valuesDatasheet maximum ratings — not to be exceeded

Specifications of 6W6GT — Limiting values
Plate voltageVa max	300 V
Screen voltageVg2 max	185 V
Plate dissipationPa max	10 W
Screen dissipationPg2 max	1.25 W

Mechanical

Specifications of 6W6GT — Mechanical
Base	Octal
Rarity	Common
Pinout

Small signalDatasheet parameters at the reference operating point — not limits

Specifications of 6W6GT — Small signal
Transconductance	8 mA/V
Plate resistance	13 kΩ
Amplification factor	6

Capacitances

Specifications of 6W6GT — Capacitances
Input	15 pF
Grid–plate	0.8 pF
Output	9 pF

Charactereditorial reading, not a measurement

Specifications of 6W6GT — Character
Gain	6%
Power	25%
Drive	87%
Linearity	95%

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

Typical operation

Conditions published by the manufacturers, one row per condition. Nothing is computed.

Typical operation
Setup	Va	Vg1 / Rk	Ia	gm	μ	rp	Source
Class A, single-endedtriode connection · cathode bias	225 V	-30 V	22 mA	3.8 mA/V	6.2	1.6 kΩ	OCR, to be checked Hytron Corporation · 1939 · p. 3 · transcript

Using this tube

Interactive loadline calculator not available for this tube yet — it needs calibrated Koren or Ayumi parameters.

Replace or compare

Sources

By Jean-Michel Falligan DevergneReviewed May 29, 2026Source : audit-us_b (CLEAN — matches canonical datasheet)

Manufacturer datasheets

4 manufacturer datasheets cross-checked for 6W6GT4 verified

6W6GT DatasheetLocal mirror · PDF

SPICE models

Revision and verification status

Source: audit-us_b (CLEAN — matches canonical datasheet)
Reviewed: 2026-05-29
Status: DataModelCalc
Model: under review

Context

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

Introduced: 1939
Manufacturer: RCA
Era: Pre-War

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