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.

By Jean-Michel Falligan Devergne · Reviewed May 29, 2026

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T110-1 Triode Vacuum Tube

Triode5V / 2ASpecialSPICE

SourceKR Audio T100 datasheet (Solen / Technology Factory)Reviewed2026-05-29StatusDataModelCalcModelNorman KorenPDF

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

Datasheet ↗SPICE

T110-1 — KR Audio — triode vacuum tube — (2000)

1.7kΩ

3.0mA/V

6.0pF

13.0pF

6.50pF

GAIN6%

POWER100%

DRIVE98%

LINEARITY95%

SPECIFICATIONS

Heater5 V · 2 A

Max Plate Voltage1250 V

Pa max100 W

Gain Factor6

gm3 mA/V

rp1.7 kΩ

Inter-electrode capacitances

Cgk6 pF

Cgp13 pF

Cpk6.5 pF

PinoutSpecial

Era2000

RaritySought-after

HEATER5V / 2A

MAX PLATE1250V / 100W

BASEspecial

Source datasheets

1 manufacturer datasheets cross-checked for T110-1

1 verified

TYPICAL OPERATING POINT

Va750V

Ia105.43mA

Vg-90.75V

Pd79.07W

RL4kΩ

Av10.9dB

EXECUTIVE SUMMARY

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.

APPLICATIONS

SET outputPush-pull outputHeadphone output

Generic triode power (set) stage

• Hi-Fi stereo• Headphone amp• PA/public address

HISTORY

Introduced2000ManufacturerKR Audio

Modern

T110-1 Datasheet

Frank's Electron Tube Pages · PDF

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METRIX TESTER

Test this tube on a Metrix

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