Peterson AutoStrobe 490ST Piano Stretch Tuner


Only 1 left in stock



Only 1 left in stock

Capable of handling “stretched” interval tuning, this is the instrument technician’s most valuable tool. The Peterson AutoStrobe 490ST offers a vast array of selectable “stretched” tuning options, including pianos of all types. Enjoy the instantaneous response times that only a Peterson can deliver and the relative tuning display of any audio source to 0.1 of a cent (1/1000 of a semitone) accuracy!

With the Model 490-ST, students, technicians, and musicians of all levels can utilize automatic (hands-free) note selection for absolutely the most accurate tuning of any instrument. Key features including real-time display of intonation to improve performance and listening skills while playing as well as mutable throughputs for in-line (yet silent) tuning during performances round out the package!


  • Wide Selection Of Pre-Programmed Stretch Files – Tables With Optimized Tunings For All Piano Types And Sizes. Up To 31 Additional Files May Be Programmed By The User.
  • Automatic Note Selection
  • Automatic Image Clarity And Contrast Control – Internal Compensation For Optimal Viewing Over A Wide Range Of Source Pitch And Volume.
  • Enhanced Clarity For Upper And Lower Register Notes – +2/-1 Display Feature Shifts The Strobe Patterns Into More Visible Middle Ranges – Bass Note Patterns Can Be Displayed Two Octaves Higher And Treble Note Patterns Can Be Displayed One Octave Lower In Strobe Display.
  • External Input And Through Output With Mute – For In-Line, Silent Tuning During Performances.



Power Supply: Built-In (IEC)


Stretch Tuning Tables: 9 Preset Stretches


Note Range: C1 to B8


Note Selection: Automatic Or Manual


Foot Pedal Control: +/- Octave, Note Increment


Peterson Connect Compatible: No


Form Factor: Desktop/Bench


Accuracy: 0.1 Cents


Display Type: Single Analog Strobe Disc


Display Resolution: Infinite (Analog)


Construction: Metal Casing


Product Dimensions LxWxH: 13.4″ x 6.375″ x 3.5″


Product Weight: 7lbs. (3.18kg)


USB Port: No


Power: AC 100V to 240V


Built-In Microphone: Yes


Built-In Speaker: No


Metronome: No


Inputs: 1/4″ Jack


Outputs: 1/4″ Thru


Mute-able Output: Footswitch Controlled


Tone Generator: No


Concert A Range: 350Hz to 550Hz


Global Cent Offset Range: +/- 50 Cents


Transposition Range: Keys of C, Bb, F, Eb


Frequency Response Range: 32.70Hz to 7902.13Hz


Warranty: 1 Year


User Presets: 255 User Presets


Historic Temperaments: Yes

SKU: MN-9KRP-IT6K Category: