Aleph J

About the Aleph J

The First Watt Aleph J is a voltage source amplifier that carries on the tradition of the Pass Labs Aleph series, combining the best elements of the Aleph 3 and 30 while improving upon previous First Watt designs like the F1 and F2. Designed by legendary amplifier designer Nelson Pass, who states 'I consider it the best of the Aleph series,' the Aleph J features a simplified signal path with reduced negative feedback, improved power supply filtration, and an input stage using high-quality matched JFETs. The amplifier operates in single-ended Class A mode using output MOSFETs, producing a natural and liquid sound with 2nd harmonic distortion character. Key improvements include 15 dB less negative feedback than the original Aleph, 15 dB less noise, no electrolytic capacitors in the signal path, and exceptional stability without lag compensation. The amplifier is designed for use with fairly sensitive speakers with benign impedance characteristics and is highly reliable with no known load that can damage it.