Just in case anyone was looking for some. It's a lot of misc. knobs but there are four that look like the arrow knobs on the RCA theremin.
Auction (http://cgi.ebay.com/Lot-of-Vintage-Radio-Knobs_W0QQitemZ270463729891QQcmdZViewItemQQptZVintage_Electronics_R2?hash=item3ef8e500e3&_trksid=p3286.c0.m14#ht_500wt_976)
I don't know how hard they are to find but this is the first time I've seen any without a theremin attached to them.
Put 'em on your Etherwave standard for that vintage tone!
Auction (http://cgi.ebay.com/Lot-of-Vintage-Radio-Knobs_W0QQitemZ270463729891QQcmdZViewItemQQptZVintage_Electronics_R2?hash=item3ef8e500e3&_trksid=p3286.c0.m14#ht_500wt_976)
I don't know how hard they are to find but this is the first time I've seen any without a theremin attached to them.
Put 'em on your Etherwave standard for that vintage tone!