Unlike later electronic organs with conventional tab stops, early Thomas electronic organs utilized a dial control for their stops, presumably to add a certain familiarity to its users since the dials worked much like those on a radio or television.

This may be evidenced by the introduction of the Talking Organ with its "Built-In Teacher," a phonograph intended for use with instructional recordings.

Thomas also took over manufacturing rights of the Moog synthesizer and enjoyed heavy celebrity endorsement from the likes of Lawrence Welk, whose organist Bob Ralston both played a Thomas on The Lawrence Welk Show and on tour at organ and piano shops to demonstrate the greatly improved tonal quality of the new models, and Lucille Ball, who featured a Thomas on at least one episode of The Lucy Show.

Another innovation during its heyday was Color-Glo, an instructional system which illuminated the keys of the manuals (and therefore their corresponding notes in reverse relief) from behind with fluorescent lights.

These features and others were incorporated across the product line throughout the 1960s, including small, relatively inexpensive spinet models with 37-note manuals (the AR1) and a unique "arc" 13-note pedal board, another Thomas Organ innovation, although one which was too narrow to allow true heel-toe playing.

Larger models included the Concert Serenade and the Lawrence Welk, each with two 44-note manuals and a 25-note pedal board.