Sorry if I'm prolonging the off-topicality, but here is a company that
sells vacuum tubes, etc.: New Sensor Corp., 133 5th Ave., NY, NY 10003,
(212)529-0466, 1(800)633-5477, Fax (212)529-0486. I couldn't find a more
current price list than 1994, so the phone #s may be obsolete. I, too,
have a Dual turntable sitting in the closet, waiting for someone to come
up with a replacement plastic gear that I couldn't find locally.