Early 1970s Allen Digital Computer organ expression pedal photocell problem @retrochad
Early 1970s Allen Digital Computer organ expression pedal photocell problem @retrochad
Uploaded October 2011 | Updated September 2026, 1 week ago
This organ has been experiencing intermittent and sometimes drastic changes in loudness so I disconnected the capacitors connecting the expression photocells to the audio circuits. I just change the stop selection to change volume so I will not miss the expression pedal. I will try to see if I can figure out what photocells to use though to get it back eventually to full operation.
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Early 1970's Allen Digital Computer organ expression pedal photocell problem

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