What is the 6AH6 vacuum tube?

The 6AH6 is a pentode vacuum tube designed for rf / preamp applications. High-Gm sharp pentode..

What are the key specifications of the 6AH6?

Amplification factor μ ≈ 40, transconductance gm ≈ 9 mA/V, plate resistance rp ≈ 500.0 kΩ, max plate voltage 300 V, max plate dissipation 3.2 W, heater 6.3 V / 0.45 A.

Is the 6AH6 still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the 6AH6 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 6AH6 sound like?

High-Gm sharp pentode.. 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.

6AH6 Pentode Vacuum Tube

Small-signal pentode for low-noise voltage amplification

PentodeHeater 6.3 V · 0.45 A7-pin MiniatureRCA 1952

Plate dissipation: 3.2W
Max plate voltage: 300V
Amplification factor: 40
Transconductance: 9mA/V
Plate resistance: 500kΩ

6AH6

Characteristics

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

HeaterIndirectly heated

Specifications of 6AH6 — Heater
Heater voltageVh	6.3 V
Heater currentIh	0.45 A

Limiting valuesDatasheet maximum ratings — not to be exceeded

Specifications of 6AH6 — Limiting values
Plate voltageVa max	300 V
Plate dissipationPa max	3.2 W

Mechanical

Specifications of 6AH6 — Mechanical
Base	7-pin Miniature
Rarity	Common
Pinout

Small signalDatasheet parameters at the reference operating point — not limits

Specifications of 6AH6 — Small signal
Transconductance	9 mA/V
Plate resistance	500 kΩ
Amplification factor	40

Capacitances

Specifications of 6AH6 — Capacitances
Input	10 pF
Grid–plate	0.02 pF
Output	3.6 pF

Charactereditorial reading, not a measurement

Specifications of 6AH6 — Character
Gain	40%
Power	8%
Drive	0%
Linearity	80%

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

Using this tube

Applications

Voltage amplifier

Generic pentode rf / preamp stage

Replace or compare

Sources

By Jean-Michel Falligan DevergneReviewed May 29, 2026Source : audit-us_a (CLEAN — matches canonical datasheet)Active model : Koren pentode

Manufacturer datasheets

2 manufacturer datasheets cross-checked for 6AH62 verified

6AH6 DatasheetLocal mirror · PDF

SPICE models

Revision and verification status

Source: audit-us_a (CLEAN — matches canonical datasheet)
Reviewed: 2026-05-29
Status: DataModelCalc
Model: Koren pentode

Context

The 6AH6 is a indirectly-heated pentode from RCA, introduced around 1952. It provides a gain factor (μ) of 40 with 500.0kΩ plate resistance. Commonly used in rf / preamp applications. High-Gm sharp pentode.

History

Introduced: 1952
Manufacturer: RCA
Era: Golden Age

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