Bach's music on the Schnitger organ in Cappel – he became an apprentice under the two leading American tracker action pipe organ builders, Fritz Noack (1964–1966) and Charles Fisk (1966–1967) and then served as a journeyman (Geselle) with the Rudolph von Beckerath firm in Hamburg in 1967–68 to complete his training, especially in making reed pipes.

He built 66 organs that are located in 23 states, Canada, Sweden, and Japan, and was a teacher to many upcoming younger builders, including Bruce Shull, Michael Bigelow, Charles Ruggles, Paul Fritts, Munetaka Yokota, Bruce Fowkes, Trent Buhr, Karl Nelson, David Petty, and Aaron Reichert.

Since its introduction in 1978, the "Bach" temperament by Herbert Anton Kellner[4] has become Brombaugh's standard tuning, though several of his organs are tuned in 1/4 Syntonic comma Meantone where their primary intention is for historically oriented performance of the organ literature older than that of Johann Sebastian Bach's.

Many of his easily movable small positives have transposition capabilities to facilitate their playability at different pitches; these (excepting his Op.

For example, his Opus 35 – an organ of 3,250 pipes, 3 manuals, and pedal with 46 stops that was dedicated on Pentecost 2001 at the First Presbyterian Church in Springfield, Illinois – is a synthesis of historical and modern techniques.