Threshold SL10 voorversterker


Fantastische high end voorversterker van Treshold, ingeruild in zeer goede staat.

The Threshold SL-10 is a remarkable preamplifier that set new standards during its time and remains a leading-edge component even today. Let’s delve into its features:

  • Design and Build:
  • The SL-10 is a fully cascode Class A preamp known for its exemplary construction.
  • It follows the tradition of the legendary NS 10 preamp, which was the first design by Nelson Pass.
  • The interior of the SL-10 reveals premium components, including a military-grade double-sided gold-plated circuit board.
  • All connectors and switch contacts are gold plated.
  • Rotating controls are environmentally sealed.
  • The separate power supply employs Mallory computer-grade capacitors and provides immense reserve capability with quadruple decoupling from the audio circuits.


  • Circuit and Performance:
  • The SL-10 circuit features eight transistors per channel, directly coupled to the input and operated without feedback.
  • It forms an active synthesis of a transformer while avoiding reactance effects that compromise transformer performance.
  • The circuit’s accuracy eliminates the need for frequency compensation or corrective feedback, maintaining high levels of speed and phase integrity.
  • The SL-10 is designed as a modular system, consisting of two interconnected components.
  • An independent power supply module can be located at a distance from the audio module to prevent noise pickup.
  • The reserve capability of the supply far exceeds the demands of the audio module.
  • Dale and Corning metal film resistors are used throughout the discrete design.
  • Audio level control is achieved through a Waters conductive plastic dual potentiometer.
  • The chassis and cover are fabricated from sheet steel for maximum noise shielding.


  • Specifications:
  • Frequency response: 1Hz to 200kHz
  • Total harmonic distortion: 0.01%
  • Gain: 33dB (MM), 20dB (line)
  • Signal-to-noise ratio: 82dB (line)
  • Output: 3V (Pre out), 12V (Pre out Max)

The Threshold SL-10 remains a testament to advanced engineering concepts and provides uncompromised performance when paired with high-caliber associated equipment


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