The Nelson Pass Amp Camp Amp (ACA) is a low-power, pure Class A power amplifier designed to be affordable, and great-sounding when paired with high-efficiency speakers.

• Creator: Designed by legendary audio engineer Nelson Pass (of Pass Labs and First Watt).

• Purpose: Originally created for the Amp Camp workshop to teach DIY audio enthusiasts how to build a real Class A amplifier.

• Circuit: Features a simple, minimalist topology using a JFET input stage and a MOSFET output stage in a push-pull or single-ended configuration.

• Power Output: Delivers about 8 watts per channel into 8 ohms in stereo mode, or up to 15 watts when configured as a monoblock.

• Power Supply: Uses an external 19-volt DC power brick.

• Gain & Impedance: Features 14 dB of voltage gain with a 10k-ohm input impedance.

• Operation: Runs entirely in pure Class A, meaning it idles at full power and runs quite warm to the touch.

• Sonic Profile: Known for a warm, smooth, grain-free, and tube-like harmonic character.

• This is a well put together version.