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Difficult to work out how this could happen. All the presets use the same set of key contacts and bus-bars. When a preset key is selected, contacts under this key switch the signals on the bus-bars to either the drawbars or the preset wiring panel. The 8' drawbar uses a single busbar running the whole length of the manual, from under the C# preset key to the top C key. This bus-bar is used for all 8' pitch signals whether for one of the drawbar groups, or for a preset. As all the keying is common to both 8' drawbars and any preset where an 8' pitch is used in a preset, I would expect any fault in the manual that affected one 8' drawbar to equally affect the other and the presets. It could be that dendrite growth somewhere, possibly on the B preset key contacts is causing a short between two bus-bars and/or key contacts. But if so, how is it that it only affects keys above middle C.

Hello,

• I have discovered a strange issue with my ca. 1965 D-152. ?It only pertains to the B pre-set on the lower manual. ?When I play and hold a note on the 8' drawbar from middle C upward, and then play a note one octave higher,?it sounds that tone plus the pitch one octave lower. ?The issue is unique to this one drawbar. ?I did check and the lower tone does not sound when the four' drawbar is pulled, only when the corresponding pitch is played on the keyboard. ?Needless to say, this can lead to some strange, thick chords in the upper register, when the 16' is not desired! ?I'm hoping that someone can help me determine the source of this problem and suggest a fix. ?Thank you in advance!

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