Korg — At2 [upd]

The Korg AT-2 Auto Chromatic Tuner is a vintage, high-precision handheld tuner that remains a cult favorite among musicians for its reliability and "workhorse" reputation. Originally manufactured in Japan, this compact device was designed to simplify the tuning process for a wide variety of stringed and acoustic instruments. Key Features and Specifications

The AT-2 is distinguished by its blend of analog-style visual feedback and digital accuracy.

Automatic Chromatic Tuning: Automatically detects the note being played across a wide range, making it suitable for guitars, basses, and violins.

Visual Interface: Features a needle-style VU meter supplemented by Flat/Sharp LED indicators to help you quickly identify pitch status even in low-light environments.

Bypass Capability: Includes a bypass jack, allowing performers to keep the tuner in their signal chain during a live performance without disrupting their sound.

Built-in Microphone: Essential for tuning acoustic instruments where a direct cable connection isn't possible. korg at2

Power & Portability: Runs on a standard 9V battery and weighs approximately 180g (0.40 lbs). Why Musicians Still Use the AT-2

Despite the rise of clip-on tuners like the Korg AW-2 or pedalboard staples like the Korg Pitchblack series, the AT-2 holds lasting appeal for several reasons: So long my friend - Korg AT-2 tuner dies at 20

(Auto Tuner) is a vintage, compact chromatic tuner primarily designed for guitars and basses. Known for its wide detection range and automated tuning capabilities, it is a predecessor to modern handheld units like the Korg CA series. Key Features and Specifications Auto Chromatic Tuning

: Automatically detects and identifies the pitch of any note played within its wide 7-octave range Visual Indicators

: Features a needle-style analog-look meter for precise tuning, supplemented by Flat/Sharp LEDs to aid in quick pitch indication. Audio Modes : Includes a mode for manual tuning by ear. Versatile Inputs Built-in Microphone : Allows for tuning acoustic instruments without cables. Bypass/Output Jack The Korg AT-2 Auto Chromatic Tuner is a

: Features a bypass jack that enables "in-line" tuning during performances without interrupting the signal to an amplifier. Physical Specs Dimensions : 133(W) x 67(D) x 34(H) mm. : 180g (including battery). : Operates on a single 9V battery Primary Use Cases Instrument Setup

: Used by luthiers and musicians for setting intonation on electric guitars and basses. Live Performance

: The bypass jack makes it suitable for pedalboard setups where a musician needs to check tuning between songs. Acoustic Settings

: Often used for orchestral or brass band instruments via its high-sensitivity internal microphone. This unit is now considered a vintage item and is commonly found on secondary markets such as or trying to compare this to a more modern Korg model

Here’s a well-rounded write-up on the Korg AT-2 that balances technical detail with practical use. Korg AT2 vs

Korg AT2 vs. The Competition

At the time of its release, the AT2 faced competition from the Peterson StroboStomp (guitar pedal) and the Boss TU-series.

Verdict: The Boss is bombproof for rock, but inaccurate for acoustic ensembles. The Peterson is arguably more powerful (strobe visualization), but the AT2 wins on utility. You can hand the AT2 to a singer, a flutist, and a bassist in the same session without needing adapters. The Peterson requires a pedalboard; the AT2 sits on a piano lid.

Calibration Function

The AT-2 is not stuck at A=440Hz. It features a calibration mode that allows you to adjust the standard pitch (usually between 410Hz and 480Hz).

The Use Case: Essential for tuning to pianos that may have drifted, or for orchestral settings where the ensemble tunes to A=442Hz.

The "Sound Out" Mode

One of the most underrated features of the AT2 is the built-in speaker for "Sound Out" tuning. Instead of playing your instrument, you press a button, and the AT2 emits a pure sine wave of the target note (A4 = 440Hz, adjustable 410–480Hz). For wind players (oboe, flute) and vocalists, matching pitch to a pure tone is far more effective than watching a needle. The AT2's speaker is loud and clear, cutting through chamber music rehearsal chatter effortlessly.

1. The Luthier and Repair Tech

Setting intonation on an acoustic guitar requires watching the 12th fret harmonic vs. the fretted note. The AT2's 0.1-cent resolution reveals the truth. You can see the "ghost bend" of a string settling. The heavy-duty aluminum casing means it survives drops on the workbench.

Build Quality

The "2" in AT-2 often implies an evolution in design. These units are built to last. With a rugged exterior, recessed controls to prevent accidental bumps, and a clear, legible display, it is designed for the rigors of the road and the dim lighting of a stage.

5. Duplex Mode (Optional)

Play normally (strings unmuted) while also sending MIDI – great for hybrid recording or using effects.

Real-World Performance

Flute: Clips to the headjoint. Works flawlessly in mic mode (vibration mode is too sensitive on thin metal).
Trumpet/Trombone: Clips to the bell rim. Vibration mode ignores the snare drum next to you. Excellent.
Saxophone: Clips to the bell or neck. Reads perfectly even with low Bb.
Tuba: The reversible screen is a lifesaver. You can read it while the instrument rests on your thigh.