[mb_72]

Actually, the key-click occurred not for those reasons explicitly, but "...was caused by the audio signal being routed directly through the key contacts. As a key was depressed, the nine contacts under the key closed against their respective busbars at slightly different times and bounced as they closed. The sine waves from the constantly running generators would be connected at random points in their oscillation."

(from https://www.dairiki.org/HammondWiki/KeyClick)

This happened even in brand-new organs.