What is the 6Y6GT vacuum tube?

The 6Y6GT is a tetrode vacuum tube designed for power applications. Beam power..

What are the key specifications of the 6Y6GT?

Transconductance gm ≈ 7 mA/V, plate resistance rp ≈ 9.3 kΩ, max plate voltage 200 V, max plate dissipation 12.5 W, heater 6.3 V / 1.25 A.

Is the 6Y6GT still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the 6Y6GT 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 6Y6GT sound like?

Beam power.. 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.

6Y6GT Tetrode Vacuum Tube

Beam power tetrode rated at 12.5W for high-power output stages

TetrodeHeater 6.3 V · 1.25 AOctalRCA 1940

Plate dissipation: 12.5W
Max plate voltage: 200V
Max screen voltage: 135V
Transconductance: 7mA/V

6Y6GT

Characteristics

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

HeaterIndirectly heated

Specifications of 6Y6GT — Heater
Heater voltageVh	6.3 V
Heater currentIh	1.25 A

Limiting valuesDatasheet maximum ratings — not to be exceeded

Specifications of 6Y6GT — Limiting values
Plate voltageVa max	200 V
Screen voltageVg2 max	135 V
Plate dissipationPa max	12.5 W
Screen dissipationPg2 max	1.75 W

Mechanical

Specifications of 6Y6GT — Mechanical
Base	Octal
Rarity	Common
Pinout

Small signalDatasheet parameters at the reference operating point — not limits

Specifications of 6Y6GT — Small signal
Transconductance	7 mA/V
Plate resistance	9.3 kΩ

Capacitances

Specifications of 6Y6GT — Capacitances
Input	8.5 pF
Grid–plate	0.4 pF
Output	7 pF

Charactereditorial reading, not a measurement

Specifications of 6Y6GT — Character
Gain	0%
Power	31%
Drive	91%
Linearity	75%

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

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 : qsl.net 6Y6 / amplifiedparts 6Y6GT

Manufacturer datasheets

1 manufacturer datasheets cross-checked for 6Y6GT1 verified

6Y6GT DatasheetLocal mirror · PDF

SPICE models

Revision and verification status

Source: qsl.net 6Y6 / amplifiedparts 6Y6GT
Reviewed: 2026-05-29
Status: DataModelCalc
Model: under review

Context

The 6Y6GT is a indirectly-heated beam tetrode from RCA, introduced around 1940. Commonly used in power applications. Beam power.

History

Introduced: 1940
Manufacturer: RCA
Era: Pre-War

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