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The Conn ST-21 Strobotuner is a legendary, vintage electromechanical strobe tuner from the 1970s. It operates on the stroboscopic effect to provide hyper-accurate, real-time frequency analysis, making it an industry standard for tuning pianos, organs, and setting guitar intonation.

Key Features

  • Extreme Accuracy: Unlike digital tuners, analog strobe tuners project light through a spinning plastic disc to provide zero-latency pitch detection.
  • Calibration: It allows for manual pitch calibration to fine-tune standard reference pitches.
  • Input Options: It features a direct 1/4" instrument input as well as an external microphone (typically dynamic) to capture acoustic instruments.
  • Designed by the renowned brand Conn in the United States, this model is suitable for musicians looking for a high-quality tuning tool. Includes original manual and a mic.

This item is sold As-Described

This item is sold As-Described and cannot be returned unless it arrives in a condition different from how it was described or photographed. Items must be returned in original, as-shipped condition with all original packaging.Learn More.

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Listed2 days ago
ConditionExcellent (Used)
Excellent items are almost entirely free from blemishes and other visual defects and have been played or used with the utmost care.Learn more
Brand
Model
  • ST-21
Categories
Year
  • 1970s
Made In
  • United States

Product safety information may be available here.

Jed

Sanford, MI, United States
Joined Reverb:2026

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