21/10/2021
We have recently completed major chest surgery on the Minshull organ, after a number of tests earlier in the year we were horrified to discover an increasing number of air leaks between notes.
The only solution was to open up the chest for inspection.
Sadly it was discovered several layers of ply had been applied to the underside of the chest with white glue and channels flooded with lashings of the same on top of the original animal glue, in an attempt to seal the old glue which had shrunk.
In doing this the bars of the chest could not expand and contract naturally and began splitting, leaking air into neighbouring channels.
Had this not had been done there would have been a reasonable chance of saving many of the original bars.
The only solution to give us a reliable chest for the future was to replace all the bars in the chest, so here's the result, there are 62 channels and 64 bars plus 62 crossovers to attach the pallet valves to.
The channels were sealed in a fully flexible and fully reversible animal based product, which is conservation approved and used by museums.
Then calico was applied in the traditional way and sealed with a similar, fully reversible and flexible ph neutral product.
The result has proved extremely successful but put us very behind with the rest of the organ, so only half the pipework could go back in ready for a few outings, not ideal as the action has been unplayed for sometime as well.
However it was an excellent opportunity to start getting the new valve leather well bedded in, something we are unable to do where the organ is stored.
The winter project is to now begin carefully revoicing all the pipework on the correct wind pressure to ensure stable speech, volume and pitch throughout.