Aleph Ono

About the Aleph Ono

The Aleph ONO is a three-stage solid-state phono preamplifier from Pass Laboratories, designed to deliver exceptional performance with moving magnet (MM) and moving coil (MC) cartridges. It features an ultra-low noise, non-inverting pre-preamplifier stage that boosts MC signals by 25 or 30 dB without equalization, followed by a main gain stage that provides MM gain and RIAA equalization, and a third inverting unity-gain stage for balanced output. The main gain stage uses low noise matched JFETs and power MOSFETs operated in cascode mode, with no loop negative feedback in the single-ended circuit. The RIAA equalization is achieved through a combination of active and passive methods, maintaining ±0.1 dB accuracy from 20 Hz to 20 kHz. The unit offers variable cartridge loading and gain settings, with balanced outputs and very low distortion (<0.05% THD at 20 volts). It is capable of delivering up to 20 volts RMS output and has an output impedance of 150 ohms per channel. The Aleph ONO is housed in a robust chassis measuring 19" W x 4" H x 11.5" D and weighs 35 lbs. It was