Most likely the light bulb in your expression system is burned out. Allen used a #57 12-Volt automotive bulb with a black dot painted on it and a mechanical shutter system for expression control. When the light bulb burns out, the volume goes to maximum. There are multiple discussions about replacing that bulb on this Forum. It's not a difficult job once you open up the back of the organ console.
Larry is my name; Allen is an organ brand. Allen RMWTHEA.3 with RMI Electra-Piano; Allen 423-C+Gyro; Britson Opus OEM38; Steinway AR Duo-Art 7' grand piano, Mills Violano Virtuoso with MIDI; Hammond 9812H with roll player; Roland E-200; Mason&Hamlin AR Ampico grand piano, Allen ADC-5300-D with MIDI, Allen MADC-2110.
Wonderful! I pulled the back off and swapped the 57k bulb with a working S313 bulb from my consul lamps, painted the end black and presto! Volume control again! Now to find the proper bulb tomorrow.
thanks!
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