I believe Audio-Video Logic, in Urbandale, Ia, bought all the spare Dunlavey parts when they went out of business. You could inquire there. They should be able to help you.
The beauty of these comes in part because John took all his parts into his own anechoic chamber for precise measurements, then created sets that lined up and complimented each other perfectly. So just dropping in a fresh unit, even though an identical Morel or whatever to the original, might change things drastically.
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