SystemDump — amplifier designs by Parker

A directly coupled headphone amp and line stage: a keep-it-simple output stage optimized for discrete op amps, with a robust dual rail supply behind it. Two boards, through-hole.

The companion supply for the Executive: a dual rail ±15 V supply built on a discrete silicon-carbide rectifier — no bridge module, no switching spikes. Sold bare, or bundled with the gain stage board.

Still the recommendation where line level voltage is the concern. For the highest performance build, go with the Executive — it offers a true dual rail regulated power supply.

A fully DC coupled, variable gain buffer on a 24 V single rail. Its job is to drop the output impedance of a source so it drives headphones cleanly without loading the source down — no gain sought, no color added.

This is a rectifier, not a power supply. No reservoir capacitors, no regulation — you add both. AC in, raw DC out: a discrete bridge of four individual diodes rather than a moulded block, each with its own snubber, each replaceable. The same approach used on the Executive supply, on a board of its own.

A Micro CMOY — the op-amp amp that came before the Associate. No longer produced.

Class A, discrete, servo controlled — built by hand in small numbers rather than sold as a bare board. Still in development; the schematic below is where it stands.

Parker

Mechanical engineer, cyclist, mixologist — and, less obviously, an audio engineer with roots in the New York audio scene. Parker came up at a few audio companies before SystemDump, with years of electronics repair, theory and manufacturing behind the boards you see here.

By the book designs, albeit vintage books. Through a series of standards and procedures, version 1 does not go out the door just because it works: the Associate was a small indie project from 2024, built point-to-point, re-built with a revised power supply, tested, and only then laid out as a PCB and released in 2026.

When asked what else he does with the time, the answer on record is cooking hot dogs.

• Every design ships with its full bill of materials — source it anywhere you like.
• Build guides written for a first solder job, not for an engineer.
• Boutique, fully assembled units are built by hand in small numbers — order one by email or on the online forum.