The Proposed Specification

In order to solve many of the present issues and produce an instrument for the 21st Century, the pipe organ will be rebuilt and extended with the following specification:

GREAT

 

SWELL

 
  Open Diapason 8ft     Open Diapason 8ft  
  Stop’d Diapason 8ft     Stop’d Diapason 8ft  
  Dulciana 8ft     Keraulophon 8ft  
  Principal 4ft     Voix Celeste 8ft  
  Flute 4ft     Principal 4ft  
  Fifteenth 2ft     Fifteenth 2ft  
  Mixture V ranks     Mixture III ranks  
  Trumpet 8ft     Fagotto 16ft  
          Cornopean 8ft  
          Oboe 8ft  
               

PEDAL

 

COUPLERS

 
  Subbass 32ft     Swell to Great    
  Open Wood 16ft     Swell  to Pedal    
  Violone 16ft     Great  to Pedal    
  Bourdon 16ft     Swell Octave    
  Open Wood 8ft     Swell Unison off    
  Bass flute 8ft     Swell Sub-Octave    
  Bassoon 16ft          
               
               

ACCESSORIES

 

COMPASS

 
  6 Thumb pistons to Great       Manuals           CC – c 61 notes  
  6 Thumb pistons to Swell       Pedals              CC – f 30 notes  
  6 Toe pistons to Pedal       Electric action to manuals, pedals and stops.
  8 General Thumb Pistons            
  3 Reversible Thumb/Toe Pistons to Couplers   Detached console    
  1 Centrally Placed Balanced Swell Pedal     New infill panel    
               
 

 

           

The proposal is to provide new windchests throughout, thus allowing to position the pipes in the most suitable way to avoid the crowding that is present at the moment.  The Swell box will be rebuilt lower in the case and adapted to fit the new windchest.  The shutters will be controlled by an industry standard remote control device. Powerful fast magnets will operate the pallets thus eliminating leather replacement in the future.  The stop action will be controlled by drawstops at the console controlling the logic switching system which in turn will control the powerful slide magnets. 

New keyboards will be provided and the console will be rebuilt as a detached mobile one.  A new comprehensive piston system will be provided, along with a new blower and wind system.

Details of the Proposed Tonal Scheme

The organ has much pipework from William Gray 1812 and the character of the pipes is of relatively small scale producing a beautiful but gentle tone.  The successor to William Gray was the firm of Gray & Davison, who in 1870 enlarged the organ and clearly tried to increase the power of the instrument and many of the pipes were changed from their original positions. 

The proposed scheme now is to maintain the quality of the sound but increase the volume so that the organ is more effective in the nave and north aisle.  The pitch is sharp at A=448Hz at 20ºC and so in general the pitch will be lowered to the modern standard of A=440Hz at 18ºC by simply moving the pipes up one note and inserting a new pipe at a low point in the compass.  Such action will reduce the irregularity of the amount of tuning slide being used which currently affects the tone, and many pipes are very short.  Overall the tone will remain as it is now due to the small increase scale being compensated by opening the foot of the pipe - and not even an expert would be able to detect a change!

Great Organ Section

Open Diapason 8 The front pipes of generous scale are the bass of this stop.  After repairs more power will be possible, one new pipe will be inserted at an appropriate point to increase the scale.

Stopped Diapason 8 In reality this is a Chimney Flute from middle C and a Gedact from g#43.  The bass is of stopped wood pipes.  We propose to increase the scale from middle c and to install chimneys on the top pipes.

Dulicana 8 This stop to remain much as it is today but with full restoration.

Principal 4 A new pipe or pipes to be inserted at an appropriate point to increase the scale and volume.  Increasing the scale will allow the pipe to be blown slightly harder thus the tone will remain the same.

Flute 4  A wooden open flute with metal tuning flaps.  The flaps are quite closed in the treble thus softening the output, a new pipe to be inserted at an appropriate point.  The tone will improve and be more regular as the tuning flaps can all be set at the same angle.

Fifteenth 2  This stop follows the English practice of being a yet smaller scale to the Diapason and Principal.  Our proposal is to insert possibly up to three pipes, thus by blowing slightly harder to increase volume of sound the tone remains the same.           

Mixture V  This stop currently has the composition of C1, 19. 22. C25, 12. 15.  A good composition two rank mixture but not one to add substantial power and colour to the ensemble.  The proposal here is the most radical one.  There is a need to reinforce the eight foot tone to support the congregation in hymn singing and to provide a clear exciting pleno without  shrillness.  I therefore propose  a four to five rank mixture with the following composition:
C1       12. 15. 19. 22                                                 
C25       1,   8, 12, 15, 19                                           
G#45     1,   5,   8, 12, 15.      

Trumpet 8 This stop is a gently scaled chorus reed that has had various things done to it over the years.  After restoration and lowering the pitch we estimate that the power will increase and fill out the chorus.           

Swell Organ Section

Open Diapason 8  The William Gray pipes start from g below middle c, Gray & Davison then appear to have completed the stop to tenor c, this is common to the other Swell pipes.  The stop shares a bass with the Stop'd Diapason, we propose to add a quality open bass from stock to this stop.

Stopped Diapason 8  This stop, as on the Great, is a Chimney Flute but this one has chimney's to the top.  The tops are soldered with tuning made by adjusting large soft ears, the pipes will be too short at the lower pitch, a new pipe will therefore be inserted and the others adjusted accordingly.

Keraulophon 8  This stop is a Gray & Davison invention, it is of metal pipes of large string scaling with a long lead sleeve with a hole or keyhole shape cut into it.  The sleeves can be heavy and slide down  thus making the stop difficult to keep in tune.  Our intention is to keep the stop but modify the pipe with the addition of a small solder nipple that allows the angled bottom of the sleeve to rest on it.  A bass to be added to this stop.

Voix Celeste 8

Principal 4  This stop may be by William Gray, it is certainly old but it is clearly marked 'CH' for Choir, the pipes are also speaking different pitches from their markings.  The stop to be carefully logged then put in the best order.

Fifteenth 2  This stop also has a variety of markings and is only from tenor c.  The pipes to be logged then put in the best order.  A new bass of suitable scale and tone to be installed.

Mixture III  This stop will be entirely new.  The pipe design will be compatible with the present pipework.  The composition has been designed to add brightness but not harshness to the Swell chorus, the octave couplers to broaden the tonal spectrum when used.  If coupled to the Great at unison pitch it will simply reinforce the pitch but when added with octave coupler a bright chorus would be experienced but without shrillness or harshness.
C1       15, 19, 22
C25     12, 15, 19
C#38     8, 12, 15

Fagotto 16 A new stop to provide a full reed chorus within the Swell section.

Cornopean 8  The present stop is in poor condition with basses on pneumatic action.  The treble is possibly by William Gray, after careful restoration the stop should be reliable especially when the basses are properly planted on a slider chest.  The tone will be more Trumpet than Cornopean.

Oboe 8  A good stock Oboe will be introduced, and will be of a character to suit the overall tonal palette of the organ.

Pedal

Subbass 32  To add gravitas to the ensemble it has been proposed to add a digital thirty two feet tone.

Open Diapason 16  The pipes of this stop are the large wooden ones, added by Gray & Davison, but replaning, repairs and attention will greatly improve the performance of this stop.  A new treble octave to be made to facilitate the eight feet extension.

Violone 16 To give a wider variety of tone and to add clarity to the Pedal line a broad string of this tone to be digitally supplied.

Bourdon 16  This stop has a mixed provenance, it is also shared unsuccessfully with the bass of the Swell Double Diapason 16.  We propose the whole stop is used just for the Pedal 16 feet and 8 feet derivation.

Open Wood 8  This stop will be a derivation from the Open Diap 16..

Flute 8  An extension from the existing Bourdon 16.

Bassoon 16 A gentle fundamentally sound to be added digitally to give a clear line and extra registrational possibilities.

Details of the Proposed Action and Works

Pipes
All the pipes will be taken out of the organ and removed from site to Peter Collins' workshop.  All metal pipes will be thoroughly cleaned inside and out, and repaired as required by the organ builder's pipemakers.  To increase the scale in some stops new pipes of the same style will be inserted, indeed the majority of stops will have the pipes ‘moved up’ one note to provide adequate length for the ‘new’ lower pitch. The wooden pipes will have their stoppers removed where fitted, and the bodies will be cleaned inside and out and checked for soundness.  All necessary repairs will be carried out and compatible hot glue will be the adhesive used.  The stoppers will be checked for fit and all will receive new leathers.  Where fitted, metal tuning pieces will be carefully examined and cleaned, and any cracked ones will be replaced by new ones in a similar grade of metal.  Any other repairs carried out to the pipes will be in strict style with the other pipework.  The present tuning slides are now rusty, so all of these will be replaced with new. 

The front pipes are the original, they are of a high percentage of lead and relatively soft.  About twenty years ago they were damaged then repaired and re-gilded as part of the early 1990s work.  These pipes will only be cleaned and any broken tuning pieces will be re-worked.  The two sets of reed stops (the Great Trumpet and the Swell Cornopean) will be removed to the workshop and will be carefully dismantled - each shallot and tongue will be cleaned with methylated spirits taking great care not to interfere with the original settings.  Once the tubes have been cleaned, the reeds will be reassembled and then put onto a voicing machine.  Any troublesome notes with have the curves re-set to obtain the intended tone and attack.  Following this work the pipes will be put on wind and adjusted as necessary to achieve the original sound.  When the organ has been re-assembled in the Church and all is ready, the pipes will be inserted and thoroughly regulated for correctness of speech and balance in the original style. After all the voicing work ius completed the organ will then be fine tuned. 

During the regulation and fine tuning the Builders will require quietness in the Church.  The pitch of the organ is currently found to be A=448 Hz this will be reset to A=440Hz at 18ºC. 

Windchests
The present multiplicity of windchests to be discarded, all to be replaced with three new slider windchests with two off note chests for the largest basses operated in the Willis style with a large pneumatic operating the pallet.  The new windchests would be of our standard proven design using high grade laminates for the grid and toe boards with a solid wood well frame. Each windchest to have a floating frame without a valve, in the Pedal the plate would regulate, via an internal valve, the volume and pressure of wind.  The pallets to be our standard cedar ones, these to be connected to large format magnets for powerful and quiet operation.  The bass channels where necessary to be provided with auxiliary pallets.  The sliders to be of three millimetre paxolin with Schmid sealing rings above then.  All necessary racks and stays to be provided.

Manual and Pedal Action
The present mechanical action to be removed.  An entirely new electric action to be installed, this to consist of optical switching at the keyboard connected by cable to a logic system in turn wired to powerful magnets in the new windchests.  All cables to be of adequate section for the electrical loads involved.

Drawstop Action
The present mechanical action to be dismantled and be replaced by a modern electric system.  New electro-magnetic units to be fitted behind the console jambs, these to be connected to the present drawstops and any new copies of the old.  Wiring to be connected via the logic system to the industry standard powerful electro-magnets at the slide ends.

Bellows and Wind System
The present original large bellows to be replaced by a new single rise one that will control the pressure and volume to the manual windchests.  The pedal windchest will be fed at blower pressure and the wind regulated by its own internal valve.  A new simple trunking system to be designed constructed and fitted.  All trunks to be of quality plywood with large fixing collars bedded with thick natural leather.  Conveyances to offset pipes would all be new and be of modern quality flexible ducting.  The Tremulant would be a modern electro-pneumatic device gently pushing the bottom plate of the appropriate windchest.

Swell Box
The swell box to be dismantled then rebuilt to fit the new windchest and stop list.  A new mechanical swell pedal centrally placed to be provided, this to have new trundles and rods as the layout demands.  The swell box to be rebuilt into a lower position to improve the appearance of the organ.

Manual Keys
Two new keyboards of compass C1 – c 61 notes to be provided, these to have resin ivory naturals with ebony sharps.  The keys to be of tri-partite laminate construction to ensure stability.  Pistons to be set out to an agreed layout.

Pedalboard
A new pedalboard to RCO recommended dimensions to be supplied and fitted, this to have oak frames with maple naturals and sharps.

Console
The present console to be dismantled and removed.  A new console to be made and set upon a mobile platform, all to be sensitively designed.  The console to be normally positioned against the case to give the appearance of being attached.  A data cable link to be supplied to permit use of the console in the nave.

Casework and Frame
The case is of an elaborate design, it is generally in good condition, all to be cleaned then waxed over.
Removing the console will leave a substantial gap in the case, new panels in suitable style to be designed, made and fitted, all to be stained to match the case. The plan for this can be viewed by clicking here. The rear panelling has suffered from enlargement over the years, this to all be tidied up and made into a neat piece of work.  The original support system will have to be altered to accommodate the revised layout.  The case to be moved to a new position slightly forward of the present one, approximately 0.8 metre west and 0.5 metre south.

Blower
The blower is an old machine placed in the vestry, presently the machine is out of balance and making a considerable noise, we allow to replace with a new Laukhuff blower.

Low Voltage
The new electric action operates on 14 volts DC, we allow to supply a new power unit and fit within the logic system.