I’m working with a salvaged keyboard which will be used to test wind-chests of 1875 Henry Erben organ (electrified in 1920s) which had its console removed 25 years ago. The salvaged keyboard has contacts only, at end of each key. So I ‘think’ this is how it should be wired:
- a single common 12Vdc Positive comes from rectifier to a single common under the contacts.
- The contact of each key then goes to each chest magnet, via the spreader board.
- The negative returns to the rectifier via the common Negative at the wind-chest.
- So for the keyboard itself I only need a common Positive feed going in, as well as each Positive wire coming from each key contact, going out to the spreader board.
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