What is the 6BX7GT vacuum tube?

The 6BX7GT is a triode vacuum tube designed for driver / otl applications. High-current driver..

What is a 6BX7GT substitute or equivalent?

Direct equivalents to the 6BX7GT 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 6BX7GT?

Amplification factor μ ≈ 10, transconductance gm ≈ 7.6 mA/V, plate resistance rp ≈ 1.3 kΩ, max plate voltage 500 V, max plate dissipation 10 W, heater 6.3 V / 1.5 A.

Is the 6BX7GT still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the 6BX7GT 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 6BX7GT sound like?

High-current driver.. 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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6BX7GT Triode Vacuum Tube

Dual triode6.3V / 1.5AOctalSPICE

SourceRCA 6BX7GT datasheet — dual triode; corrected sections=2Reviewed2026-05-29StatusDataModelCalcModel2 enginesPDF

Power triode delivering 10W for push-pull and SET designs

Datasheet ↗SPICE

6BX7GT — GE·Sylvania — triode vacuum tube — (1952)

1.3kΩ

7.6mA/V

4.4pF

4.2pF

1.10pF

GAIN10%

POWER25%

DRIVE99%

LINEARITY95%

SPECIFICATIONS

Heater6.3 V · 1.5 A

Max Plate Voltage500 V

Pa max10 W

Gain Factor10

gm7.6 mA/V

rp1.3 kΩ

Inter-electrode capacitances

Cgk4.4 pF

Cgp4.2 pF

Cpk1.1 pF

PinoutOctal

Era1952

RarityCommon

HEATER6.3V / 1.5A

MAX PLATE500V / 10W

BASEoctal

SECTIONS2 (dual)

Source datasheets

2 manufacturer datasheets cross-checked for 6BX7GT

2 verified

TYPICAL OPERATING POINT

SPICE model(2 available)2 .subckt available ↓

Va250V

Ia29mA

Vg-19.487170999999996V

Pd7.25W

RL5kΩ

Av18.7dB

EXECUTIVE SUMMARY

The 6BX7GT is a dual indirectly-heated triode from GE·Sylvania, introduced around 1952. It provides a gain factor (μ) of 10 with 1300Ω plate resistance. Commonly used in driver / otl applications. High-current driver.

APPLICATIONS

SET outputPush-pull outputHeadphone outputPhase splitter

Generic triode driver / otl stage

• Headphone amp

HISTORY

Introduced1952ManufacturerGE·Sylvania

Golden Age

6BX7GT Datasheet

Local mirror · PDF

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METRIX TESTER

Test this tube on a Metrix

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