The Grand Organ was built by Henry Willis & Sons between 1922 and 1932, in the West Gallery of the Cathedral. In 1984 it was completely overhauled and restored by Harrison and Harrison. Improvements in the mechanical layout were made, and these included conversion of the pneumatic actions to an electro-pneumatic system. Early in 1996, Harrison and Harrison cleaned and overhauled the instument, revoicing selected stops to their pre-1984 state and adding a sequencer to control the general pistons. The main console is in the centre of the organ gallery. The specification is as follows:
GREAT ORGAN
Great First Division
Double Open Diapason 16
16
Open Diapason No. 1 8
8
Open Diapason No. 2 8
8
Octave 4
4
Octave Quint 2 2⁄3
2/3
Super Octave 2
V
Grand Chorus 15.19.22.26.29 V
V
Double Trumpet 16
16
Trumpet 8
8
Clarion 4
4
Great Second Division
Bourdon 16
16
Open Diapason No. 3 8
8
Flûte Harmonique 8
8
Quint 5 1⁄3
1/3
Principal 4
4
Flûte Couverte 4
4
Tenth 3 1⁄5
1/5
Twelfth 2 2⁄3
2/3
Fifteenth 2
2
SWELL ORGAN (Enc)
Violon 16
16
Geigen Diapason 8
8
Rohr Flute 8
8
Echo Viole 8
8
Viole Celeste (AA) 8
8
Octave Geigen 4
4
Suabe Flute (triangular) 4
4
Twelfth 2 2⁄3
2/3
Fifteenth 2
2
Harmonics 17.19.22 III
III
Vox Humana 8
8
Oboe 8
8
Tremulant -
Waldhorn 16
16
Trumpet 8
8
Clarion 4
4
CHOIRORGAN (Enc)
Contra Dulciana
16
Open Diapason
8
Viola
8
Cor-de-Nuit
8
Cor-de-Nuit Celeste
8
Sylvestrina
8
Gemshorn
4
Nason Flute
4
Nazard
22⁄3
Octavin
2
Tierce
13⁄5
Trompette
8
Tremulant
-
SOLOORGAN (Enc)
Quintaten
16
Violoncello
8
’Cello Celestes
8
Tibia
8
Salicional
8
Unda Maris
8
Concert Flute
4
Piccolo Harmonique
2
Cor Anglais
16
Corno-di-Bassetto
8
Orchestral Oboe
8
Tremulant
-
French Horn
8
Orchestral Trumpet
8
Tuba Magna (unenclosed)
8
ACCESSORIES
8 toe pistons to the Pedal Organ
8 pistons to Choir, Great, Swell & Solo Organs
Balanced expression pedals to Solo,Swell & Choir Organs