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, fully repairable — every part can be replaced.

The complete bill of materials for both boards, with ready-made DigiKey and Mouser import lists. Transformer, volume pot and standoffs are sourced separately — the full product page lists them.

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. 140 × 69 mm, M3 mounting. 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 current 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.

Signal arrives at J1, passes the volume pot and a simple gain stage built around a dual JFET op-amp; a rail splitter creates the virtual ground and an on-board regulator holds the supply at +18 V. Output leaves on two terminal blocks.

The op-amp amplifier that came before the Associate. No longer produced; kept here because a few are still out in the world.

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. Steve Guttenberg interviewed him back in 2018, long before anything independent — video 1, video 2.

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.