House Organs

Philadelphia Six-stop House Organ

Here is an instrument that is reduced to the essentials: an 8’ principal chorus and contrasting flute sounds on two manuals and pedal. A basic complement of pitches and sounds are paired with a simple, sensitive mechanism. The scaling and voicing of the pipework is chamber-oriented for hours of quality work without aural fatigue.

The entire instrument is contained in a compact casework made of cherry with curly maple and ebony secondary woods. The dimensions of the instrument allow free placement in a home, apartment, or small studio room. The organ fits under a nine-foot ceiling.

Since small organs move as frequently as their owners do, this unique design keeps the action in adjustment during relocation. This was well demonstrated when the Philadelphia organ was moved from its original installation in Madison, Wisconsin and the Ann Arbor organ was moved to the University of Houston. The modular design allows quick installation, typically taking only a few hours.  Built-in wheels allow organ placement against a wall while enabling easy access to the back of the instrument.

The Houston instrument additionally underwent a requested tonal change.  The 2' Flute was changed to a 4' Lieblich (gedact).  This provides two contrasting, balanced 8 and 4 registrations for extended practice sessions without aural fatigue.

University of Houston Six-stop Practice Organ


In Memoriam ~~ Robert H. Ferrell

Six-Stop House Organ

Series of Two Organ

a private residences in

Philadelphia, Pennsylvania

Moores School of Music

University of Houston, Texas

Manual I
8 Principal
8 Rohrflute
4 Octave

Manual II
8 Gedact

4 Lieblich
or 2 Flute

16 Subbass

Three standard couplers

Key compass: 58/30

Dimensions: 107” h, 65” w, 40”d
(excluding keyboards and pedalboard)

more pictures


Wahl Organbuilders has published a book documenting the design and construction of these instruments.

You can preview the first fifteen pages or purchase the book . Click on the cover to go to the publisher's site.