If it uses the older style rochelle salt cartridges (usually made by astatic) expect it to be bad. I have run across about a half dozen of this type, and they all were nonfunctional. I typically replace mine with these cheapy Ronette cartridges:
http://cgi.ebay.com/UNIVERSAL-REPLAC...d=p4634.c0.m14
No affilitation with this seller-he just has them in stock. I really only use them as it comes with a mounting bracket that matches up pretty well. Sounds okay, too-although I am sure that the biasing is not a match. Have fun with this one. Looks like it will be real nice.