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Philadelphia Episcopal Cathedral

Our installation of this organ was scheduled to commence on March 16, 2020. As stay-at-home orders and other government measures came into effect, these plans changed. However, this was hardly the first detour for the mighty Möller on its path to Philadelphia Episcopal Cathedral.

Opus 6425 was installed in Schwab Auditorium at Penn State University in State College, Pennsylvania, in 1936. Designed by Möller’s illustrious, imported tonal director Richard Whitelegg, the organ’s thirty-three ranks are replete with warm, bold diapasons, evocative flutes, colorful and varied strings, and four iconic reeds, all at eight-foot pitch: Trumpet, Oboe, Clarinet, and Vox Humana. The organ was fully enclosed, including all three open 16′ flue ranks—Wood Diapason, Metal Diapason, and Gemshorn. It also included, and retains today, a set of Deagan Class-A chimes and a forty-nine-note harp. When the stylistic demands of the organ world changed, this broad-shouldered organ fell into disuse, the console cable was eventually severed, and benign neglect allowed it to survive the ravages of mid-century revisions and replacements. It was in this pristine—although inoperable—condition that we first came to know Möller Opus 6425.

Our relationship with the instrument began in 2013 when we were invited to collect its constituent parts, already dismantled by another firm, with a view to restoring the organ and installing it in a church in Philadelphia. In fact, my first day as an employee at Emery Brothers was spent unloading the last truckload of parts from State College. It took some time for restoration and relocation plans to come into focus, but we eventually entered into a contract for just that: restoring the organ to like-new condition, with no tonal changes, but with an updated solid-state control system, and a redesigned layout to fit the new space.

However, plans to install the organ in this first location were discontinued, and with roughly three-quarters of the restoration work done, Möller Opus 6425 went back into storage, its future uncertain. Then, over the next few years we continued to keep our eyes open for a new home for the organ while we continued to work through our existing backlog of projects.

At the same time, we were caring for an ailing, heavily modified and digitally hybridized 1903 Austin organ at Philadelphia Episcopal Cathedral. Wind leaks from the Universal windchests, now over 110 years old, were so loud that the blower had to be turned off during the service to allow the spoken word to be heard in the church. When discussions around a long-term plan for the organ began, we immediately thought of Möller Opus 6425. All the windchests and reservoirs had been releathered, the reed pipes restored by Sam Hughes, and all the flue pipes cleaned and ready for voicing.

Some additions would be needed, including a new console and an organ in the rear gallery to support congregational and choral singing from that location. The decision was made early on to call this part of the instrument the “Nave Organ” because it has an important role as a standalone organ to support singers in the nave of the church. The decision was also made to add a few select ranks to Opus 6425 to fill out its specifications towards use in the cathedral. These were:

• 16′/8′ Tromba/Trombone (Great/Pedal)

• 32′ Harmonics (12 notes extending Trombone, 36 pipes, Pedal)

• 32′ Bourdon (12 pipes, extending existing 16′ Bourdon, Pedal)

• 16′ Double Trumpet (Swell)

• 8′ Tuba (Choir)

Around this time, we also learned of Möller Opus 6512, a two-manual Whitelegg Möller organ in a church building that was up for sale. This donor instrument provided the Tromba/Trombone pipes we added to Opus 6425 in the Great/Pedal chamber, and also allowed us to populate the Nave Organ with voices sympathetic to Opus 6425. Most of the other ranks added to Opus 6425 to create the Nave Organ came from the existing cathedral Austin. For instance, cathedral organist Wesley Parrott cleverly pointed out that the Austin Swell 4′ Traverse Flute, sub-coupled and matched to the Austin Choir 8′ Melodia, created a beautiful flute celeste effect, which we placed in the Nave Great.

In addition to its role in supporting congregational and choral singing from the rear gallery, the Nave Organ houses many of the organ’s solo voices, such as the Flugelhorn, Cromorne, Doppelflute, and Cornet (decomposé). The Nave Organ was installed first, and while assembly of the Chancel Organ was still underway, was the only organ in the cathedral for several months. Its sixteen ranks do a remarkable job of filling the room. Its design is perhaps the only real departure from a true Whitelegg installation, as the diminutive organ chambers would likely have housed an Echo or Celestial division. As it stands, several of the boldest flue voices in the organ reside in the Nave Great, including the largest diapason in the organ (42 scale, linen lead).

In its new arrangement, Opus 6425 surrounds the chancel, referred to in the cathedral as the presbyterium. the Great and Pedal divisions share an elevated chamber on the north side of the presbyterium. The Swell and Choir are stacked in the south chamber, with the Choir below and the Swell above. Each of these three divisions has two shade fronts—one facing the nave and one facing the presbyterium. The Nave Organ is split between two matching cases eleven feet above the gallery floor, with the Great in the north case and the Swell in the south case. Basses of both the 16′ Diapason and 16′ Gedeckt are mounted along the back wall, framing the rose window.

With five expressive divisions, eight shade fronts, and a total of 145 individual shades, expression control is an important aspect of our design for this installation. This is accomplished by way of an expression matrix, with a default setting and four settable expression pistons. While this isn’t the first time a church organ has had an expression matrix, to our knowledge this is the first range- and direction-settable expression matrix. In other words, any of the organ’s eight shade fronts can be set to function in either direction, for any range of travel on any of the four expression shoes in the console. This has led to a lot of experimentation and will provide endless flexibility in expression control for this deeply expressive organ. For instance, one of the settings currently in use has all shades assigned to one swell shoe, with all shades closed at the midpoint of its travel. As it is pushed forward, the Chancel Organ shades all open. Push the heel down, and the Nave Organ shades all open.

Having recently completed our relocation of Aeolian-Skinner Opus 878 into Stoneleigh, headquarters of the Organ Historical Society in Villanova, Pennsylvania [featured on the cover of the December 2019 issue of The Diapason], we elected to work with a partner to do some of the “heavy lifting” for the much larger cathedral installation. JR Neutel and the staff of Reuter Organ Company proved an excellent choice for this role, providing the new four-manual console, as well as the engineering and the lion’s share of the onsite installation labor for the project, and any new windchests and reservoirs required for added stops. As Pennsylvania and other states began reopening, we rescheduled and then commenced installation in September of 2020. The organ was dedicated in an inaugural recital featuring Tyrone Whiting, Jeff Brillhart, and Clara Gerdes-Bartz on October 24, 2021.

This project was made possible by generous funding from the Wyncote Foundation as recommended by Fred Haas and Rafael Gomez. We are also deeply grateful for the support of the cathedral community, including The Right Rev. Daniel G. P. Gutiérrez, Bishop; The Very Rev. Judith A. Sullivan, Dean; Canon for Music and the Arts Thomas Lloyd; Cathedral Organist Wesley Parrott; Canon for Administration Lynn Buggage; and Sexton Lamont Murray. Our network of suppliers and subcontractors for this project included Sam Hughes, Reuter Organ Company, Opus Two Instrument Control Systems, Organ Supply Industries, Rudewicz & Associates, and COE Percussion.


16′ Double Open Diapason 12 pipes (ext Second Open Diapason)

8′ First Open Diapason  73 pipes

8′ Second Open Diapason   73 pipes

8′ Claribel Flute 73 pipes

8′ Gemshorn 73 pipes

4′ Octave 73 pipes

4′ Harmonic Flute 73 pipes

2′ Fifteenth 61 pipes

III Mixture 183 pipes

16′ Trombone1 (ext Tromba) 12 pipes

8′ Tromba1 73 pipes


8′ Tuba (Ch)

Chimes (G–g) (25 tubes)

Great 16 - Unison Off - 4

Nave Swell on Great

Nave Great on Great

Nave on Great Pistons

Pedal Combinations on Great


16′ Lieblich Gedeckt 73 pipes

8′ Geigen Principal 73 pipes

8′ Rohr Flute 73 pipes

8′ Salicional 73 pipes

8′ Voix Celeste (TC) 61 pipes

4′ Principal 73 pipes

4′ Triangular Flute 73 pipes

IV Mixture 244 pipes

16′ Double Trumpet2 73 pipes

8′ Trumpet 73 pipes

8′ Oboe 73 pipes

8′ Vox Humana 73 pipes


Swell 16 - Unison Off - 4

Nave Swell on Swell

Nave Great on Swell

Nave on Swell Pistons

Pedal Combinations on Swell


8′ Concert Flute 73 pipes

8′ Viola 73 pipes

8′ Viola Celeste (TC) 61 pipes

8′ Dulciana 97 pipes

8′ Unda Maris (TC) 61 pipes

4′ Flute d’Amour 73 pipes

4′ Dulcet (ext Dulciana)

2-2⁄3′ Dolce Twelfth (ext Dulciana)

2′ Dolce Fifteenth (ext Dulciana)

8′ Clarinet 73 pipes


16′ Trombone (Gt)

8′ Tromba (Gt)

8′ Tuba (by F. J. Rogers, 15 inches pressure) 73 pipes

8′ Harp (TC) (49 bars)

Chimes (Gt)

Choir 16 - Unison Off - 4 - 22⁄3

Nave Swell on Choir

Nave Great on Choir

Pedal Combinations on Choir


32′ Bourdon 12 pipes

32′ Resultant

16′ Diapason 32 pipes

16′ Double Diapason (Gt)

16′ Bourdon 32 pipes

16′ Lieblich Gedeckt (Sw)

16′ Gemshorn (Gt) 12 pipes

8′ Octave (ext Diapason) 12 pipes

8′ Major Flute (ext Bourdon) 12 pipes

8′ Claribel Flute (Gt)

8′ Gemshorn (Gt)

4′ Triangular Flute (Sw)

32′ Trombone (ext 16′ Trombone, 1–12 III Harmonics) 36 pipes

16′ Trombone (Gt)

16′ Double Trumpet (Sw)

8′ Tromba (Gt)

8′ Double Trumpet (Sw)

8′ Tuba (Ch)

4′ Double Trumpet (Sw)

Chimes (Gt)


8′ Open Diapason1 61 pipes

8′ Doppleflute 49 pipes (Roosevelt, 1–12 from Melodia)

8′ Melodia2 61 pipes

8′ Bois Celeste2 (TC) 49 pipes

4′ Octave1  73 pipes

2′ Super Octave1 (ext 4′ Octave)

II Grave Mixture1 122 pipes

8′ Flugelhorn 61 pipes (from Reuter, revoiced)

8′ Cromorne3 61 pipes


8′ Tuba (Ch)

Tower Bells (13 bells)

Chimes (Gt)

Great on Nave

Nave Great 16 - Unison Off - 4


16′ Gedeckt1 (ext 8′ Gedeckt) 12 pipes

8′ Viole2 73 pipes

8′ Voix Celeste2 (TC) 61 pipes

8′ Gedeckt1 73 pipes

4′ Open Flute3 73 pipes

2-2⁄3′ Nazard 61 pipes

2′ Piccolo1 (ext 8′ Gedeckt) 12 pipes

1-3⁄5′ Tierce 61 pipes

16′ Fagotto4 (ext 8′ Fagotto) 12 pipes

8′ Fagotto4 73 pipes



Nave Swell 16 - Unison Off - 4


32′ Resultant

16′ Open Diapason (Nave Gt) 12 pipes

16′ Gedeckt (Nave Sw)

8′ Open Diapason (Nave Gt)

8′ Gedeckt (Nave Sw)

4′ Open Diapason (Nave Gt)

4′ Gedeckt (Nave Sw)

16′ Fagotto (Nave Sw)

8′ Fagotto (Nave Sw)

4′ Cromorne (Nave Gt)


Great to Pedal 8, 4

Swell to Pedal 8, 4

Choir to Pedal 8, 51⁄3, 4

Nave Great to Pedal 8, 4

Nave Swell to Pedal 8

Swell to Great 16, 8, 4

Choir to Great 16, 8, 5-1⁄3, 4, 2-2⁄3

Nave Great to Great 8, 4

Nave Swell to Great 8, 4

Swell to Choir 16, 8, 4

Nave Great to Choir 8, 4

Nave Swell to Choir 8, 4

Choir to Swell 8, 4, 2-2⁄3

Nave Great to Swell 8

Nave Swell to Swell 8

Great/Choir Transfer


1. From 1937 M. P. Möller Op. 6512

2. From 1903 Austin Organ Company Opus 73

3. From inventory

4. From 1960 M. P. Möller Op. 9453


53 ranks, 86 stops, 3,606 pipes

Click below to see photos from this installation

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