What is the 6Y6GT vacuum tube?

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

What is a 6Y6GT substitute or equivalent?

Direct equivalents to the 6Y6GT 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 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.

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

←6Y6GT

← 6W6GT 7027A →Compare…

6Y6GT Tetrode Vacuum Tube

Tetrode6.3V / 1.25AOctal

Sourceqsl.net 6Y6 / amplifiedparts 6Y6GTReviewed2026-05-29StatusDataModelCalcModelunder reviewPDF

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

Datasheet ↗

6Y6GT — RCA — tetrode vacuum tube — (1940)

9.3kΩ

7.0mA/V

8.5pF

0.4pF

7.00pF

GAIN0%

POWER31%

DRIVE91%

LINEARITY75%

SPECIFICATIONS

Heater6.3 V · 1.25 A

Max Plate Voltage200 V

Pa max12.5 W

Gain Factor—

gm7 mA/V

rp9.3 kΩ

Inter-electrode capacitances

Cgk8.5 pF

Cgp0.4 pF

Cpk7 pF

PinoutOctal

Era1940

RarityCommon

HEATER6.3V / 1.25A

MAX PLATE200V / 12.5W

BASEoctal

Source datasheets

1 manufacturer datasheets cross-checked for 6Y6GT

1 verified

EXECUTIVE SUMMARY

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

HISTORY

Introduced1940ManufacturerRCA

Pre-War

6Y6GT Datasheet

Local mirror · PDF

↗

METRIX TESTER

Test this tube on a Metrix

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

SIMILAR TETRODES

View all →

12E1Power 1614Power (PP)1625Transmitting / Power 4Y100ROutput Power 4Y75ROutput Power 5881Power (PP)5AQ5Power 5V6Power