The Rochford Compton

Diapason Bass Overhaul
The Diapason Bass consists of 12 pipes mounted on a long wind chest. It was decided to move it from it's position behind the Main chest to a position previously occupied by the Tibia Bass. This will free up space for any additional pipe ranks we may obtain. The opportunity was taken to refurbish it in the workshop prior to remounting. After removal the wind chest is taken to the workshop for inspection and disassembly.

First step is the removal of the iris wind adjusters then the top board to look at the pallet valves.
Then the magnets, Iris valves and wiring are removed to allow the wood chests to be cleaned and varnished.
(Click on pictures to enlarge)

Upon inspection the pallet valves were found to be largely OK but one was found to be split. This meant that a new diaphragm had to be cut from leather and fitted.

The Irises as usual were jammed so needed to be disassembled and cleaned. The operating rings were skimmed to allow them to move when the weight of the pipe is back on the unit. This overcomes a common failing with Compton Iris valves.

The Compound Magnets were inspected, they are in good condition so only needed cleaning and adjusting. The wind chest was cleaned and revarnished ready for the refurbished components.

Upon reassembly the repaired pallet motor was re-fitted. The Compound Magnets were re-fitted as were the Iris valves.
It was decided to make a new action current cable using genuine cotton covered copper wire as was the original. It was tested for wind leaks and is ready for re-installation into the organ in its new location.

The chest was repositioned back in the chamber in the space previously occupied by the Tibia Polyphonic Bass. Careful positioning was required as there was just enough headroom. A new wind supply was laid down and the magnet cabling to connect it to the relay completed.

Diaphone installation
Polyphonic Bass relocation
Tuba relocation
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