[mingles]

I stumbled into this recently and thought others would be interested. The ZP3 shares some of the same design principles as the Cornet and looks a lot like a Cornet! Check it out:

http://www.decware.com/newsite/ZP3.htm

If you read Steve Deckert's design notes, you'll see he thanks Jim Hagerman:

Thanks go out to J. Epstein who's original circuit inspired my early 
prototypes, and to J. Haggerman who was kind enough to offer his Cornet 
circuit boards at one point along the way and let us modify them for use in 
a ZP3. Even though that didn't end up happening, it was much appreciated. 
(While the sound and implementation of these three circuits is very different, 
the Epstein, ZP3 and Cornet are using almost the same split passive RIAA scheme).