What is the 6BX7GT vacuum tube?

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

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.

6BX7GT Triode Vacuum Tube

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

Dual triodeHeater 6.3 V · 1.5 AOctal2 sectionsGE·Sylvania 1952

Plate dissipation: 10W
Max plate voltage: 500V
Transconductance: 7.6mA/V

6BX7GT

Characteristics

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

HeaterIndirectly heated

Specifications of 6BX7GT — Heater
Heater voltageVh	6.3 V
Heater currentIh	1.5 A

Limiting valuesDatasheet maximum ratings — not to be exceeded

Specifications of 6BX7GT — Limiting values
Plate voltageVa max	500 V
Plate dissipationPa max	10 W

Mechanical

Specifications of 6BX7GT — Mechanical
Base	Octal
Rarity	Common
Pinout

Small signalDatasheet parameters at the reference operating point — not limits

Specifications of 6BX7GT — Small signal
Transconductance	7.6 mA/V
Plate resistance	1.3 kΩ
Amplification factor	10

Capacitances

Specifications of 6BX7GT — Capacitances
Grid–cathode	4.4 pF
Grid–plate	4.2 pF
Plate–cathode	1.1 pF

Charactereditorial reading, not a measurement

Specifications of 6BX7GT — Character
Gain	10%
Power	25%
Drive	99%
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
triode connection, single-endedclass not stated · cathode bias	250 V	0 V	42 mA	7.6 mA/V	10	1.3 kΩ	OCR, to be checked Tung-Sol · 1956 · p. 2 · transcript

Using this tube

Applications

SET output
Push-pull output
Headphone output
Phase splitter

Generic triode driver / otl stage

Headphone amp

Replace or compare

Sources

By Jean-Michel Falligan DevergneReviewed May 29, 2026Source : RCA 6BX7GT datasheet — dual triode; corrected sections=2Active model : Ayumi Nakabayashi · 2 engines

Manufacturer datasheets

2 manufacturer datasheets cross-checked for 6BX7GT2 verified

6BX7GT DatasheetLocal mirror · PDF

SPICE models

Revision and verification status

Source: RCA 6BX7GT datasheet — dual triode; corrected sections=2
Reviewed: 2026-05-29
Status: DataModelCalc
Model: Ayumi Nakabayashi · 2 engines

Context

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.

History

Introduced: 1952
Manufacturer: GE·Sylvania
Era: Golden Age

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