What is the T100(KR) vacuum tube?

The T100(KR) (T100 (KR)) is a triode vacuum tube designed for power (set) applications. Modern KR Audio DHT..

What are the key specifications of the T100(KR)?

Amplification factor μ ≈ 5.3, transconductance gm ≈ 4.4 mA/V, plate resistance rp ≈ 1.2 kΩ, max plate voltage 1000 V, max plate dissipation 100 W, heater 5 V / 2 A.

Is the T100(KR) still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the T100(KR) as Sought-after 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 T100(KR) sound like?

Modern KR Audio DHT.. 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.

T100 (KR) Triode Vacuum Tube

Power triode delivering 100W for push-pull and SET designs

TriodeHeater 5 V · 2 ASpecialKR Audio 2000

Plate dissipation: 100W
Max plate voltage: 1000V
Transconductance: 4.4mA/V

T100 (KR)

Characteristics

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

HeaterDirectly heated

Specifications of T100(KR) — Heater
Heater voltageVh	5 V
Heater currentIh	2 A

Limiting valuesDatasheet maximum ratings — not to be exceeded

Specifications of T100(KR) — Limiting values
Plate voltageVa max	1000 V
Plate dissipationPa max	100 W

Mechanical

Specifications of T100(KR) — Mechanical
Base	Special
Rarity	Sought-after
Pinout

Small signalDatasheet parameters at the reference operating point — not limits

Specifications of T100(KR) — Small signal
Transconductance	4.4 mA/V
Plate resistance	1.2 kΩ
Amplification factor	5.3

Capacitances

Specifications of T100(KR) — Capacitances
Grid–cathode	9 pF
Grid–plate	14 pF
Plate–cathode	7 pF

Charactereditorial reading, not a measurement

Specifications of T100(KR) — Character
Gain	5%
Power	100%
Drive	99%
Linearity	95%

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

Using this tube

Applications

SET output
Push-pull output
Headphone output

Generic triode power (set) stage

Hi-Fi stereoHeadphone ampPA/public address

Replace or compare

Sources

By Jean-Michel Falligan DevergneReviewed May 9, 2026Source : KR Audio T100 datasheet (Solen / Technology Factory)Active model : Norman Koren

Manufacturer datasheets

T100(KR) DatasheetFrank's Electron Tube Pages · PDF

SPICE models

Revision and verification status

Source: KR Audio T100 datasheet (Solen / Technology Factory)
Reviewed: 2026-05-09
Status: DataModelCalc
Model: Norman Koren

Context

The T100(KR) is a directly-heated triode from KR Audio, introduced around 2000. It provides a gain factor (μ) of 5.3 with 1200Ω plate resistance. Commonly used in power (set) applications. Modern KR Audio DHT.

History

Introduced: 2000
Manufacturer: KR Audio
Era: Modern

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