What is the T110-1 vacuum tube?

The T110-1 is a triode vacuum tube designed for power (set) applications. KR Audio variant..

What is a T110-1 substitute or equivalent?

Direct equivalents to the T110-1 include KR Audio T100 (T110-1 not in published catalog). 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 T110-1?

Amplification factor μ ≈ 6, transconductance gm ≈ 3 mA/V, plate resistance rp ≈ 1.7 kΩ, max plate voltage 1250 V, max plate dissipation 100 W, heater 5 V / 2 A.

Is the T110-1 still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the T110-1 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 T110-1 sound like?

KR Audio variant.. 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.

T110-1 Triode Vacuum Tube

Also known as KR Audio T100 (T110-1 not in published catalog)

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

TriodeHeater 5 V · 2 ASpecialKR Audio 2000

Plate dissipation: 100W
Max plate voltage: 1250V
Transconductance: 3mA/V

T110-1

Characteristics

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

HeaterDirectly heated

Specifications of T110-1 — Heater
Heater voltageVh	5 V
Heater currentIh	2 A

Limiting valuesDatasheet maximum ratings — not to be exceeded

Specifications of T110-1 — Limiting values
Plate voltageVa max	1250 V
Plate dissipationPa max	100 W

Mechanical

Specifications of T110-1 — Mechanical
Base	Special
Rarity	Sought-after
Pinout

Small signalDatasheet parameters at the reference operating point — not limits

Specifications of T110-1 — Small signal
Transconductance	3 mA/V
Plate resistance	1.7 kΩ
Amplification factor	6

Capacitances

Specifications of T110-1 — Capacitances
Grid–cathode	6 pF
Grid–plate	13 pF
Plate–cathode	6.5 pF

Charactereditorial reading, not a measurement

Specifications of T110-1 — Character
Gain	6%
Power	100%
Drive	98%
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	Ia	Source
Class AB1, push-pulltriode connection	1250 V	120 mA	OCR, to be checked Brown Boveri · n/a (réf. dessins 75443/75444/75576) · p. 3 · transcript

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 29, 2026Source : KR Audio T100 datasheet (Solen / Technology Factory)Active model : Norman Koren

Manufacturer datasheets

1 manufacturer datasheets cross-checked for T110-11 verified

T110-1 DatasheetFrank's Electron Tube Pages · PDF

SPICE models

Revision and verification status

Source: KR Audio T100 datasheet (Solen / Technology Factory)
Reviewed: 2026-05-29
Status: DataModelCalc
Model: Norman Koren

Context

The T110-1 is a directly-heated triode from KR Audio, introduced around 2000. It provides a gain factor (μ) of 6 with 1700Ω plate resistance. Commonly used in power (set) applications. KR Audio variant.

History

Introduced: 2000
Manufacturer: KR Audio
Era: Modern

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