What is the 6V6GT vacuum tube?

The 6V6GT is a tetrode vacuum tube designed for power (se/pp) applications. GT envelope..

What is a 6V6GT substitute or equivalent?

Direct equivalents to the 6V6GT include 6V6. 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 6V6GT?

Amplification factor μ ≈ 10, transconductance gm ≈ 4.1 mA/V, plate resistance rp ≈ 50.0 kΩ, max plate voltage 315 V, max plate dissipation 12 W, heater 6.3 V / 0.45 A.

Is the 6V6GT still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the 6V6GT 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 6V6GT sound like?

GT envelope.. 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

←6V6GT

← 6V6 6V6S →Compare → 6V6

6V6GT Tetrode Vacuum Tube

Tetrode6.3V / 0.45AOctal

SourceFrank/pocnet 6V6 datasheetReviewed2026-05-29StatusDataModelCalcModelunder reviewPDF

Beam power tetrode rated at 12W for high-power output stages

Datasheet ↗

6V6GT — RCA — tetrode vacuum tube — (1937)

50.0kΩ

4.1mA/V

9.0pF

0.7pF

7.50pF

GAIN10%

POWER30%

DRIVE50%

LINEARITY95%

SPECIFICATIONS

Heater6.3 V · 0.45 A

Max Plate Voltage315 V

Pa max12 W

Gain Factor10

gm4.1 mA/V

rp50.0 kΩ

Inter-electrode capacitances

Cgk9 pF

Cgp0.7 pF

Cpk7.5 pF

PinoutOctal

Era1937

RarityCommon

HEATER6.3V / 0.45A

MAX PLATE315V / 12W

BASEoctal

Source datasheets

3 manufacturer datasheets cross-checked for 6V6GT

3 verified

Triode-connectedGENERAL ELECTRICMarch 1955 (3-55; supersedes ET-T351D dated 6-53)

Specs when the screen grid (g2) is tied to the anode — the tube acts as a triode.

7.5

According to GENERAL ELECTRIC (GE Electronic Tubes, Schenectady NY) — ET-T914 (March 1955 (3-55; supersedes ET-T351D dated 6-53)): « triode-connected »

EXECUTIVE SUMMARY

The 6V6GT is a indirectly-heated beam tetrode from RCA, introduced around 1937. It provides a gain factor (μ) of 10 with 50.0kΩ plate resistance. Commonly used in power (se/pp) applications. GT envelope.

VS 6V6

Rp -4%Pd 0%Full comparison →

HISTORY

Introduced1937ManufacturerRCA

Pre-War