http://glass-ware.stores.yahoo.net/aiphpcb.html
Or you can buy a full kit with all parts (board, parts, power supply, tubes and chassis) & instructions from tubes4hifi for $590.
http://www.tubes4hifi.com/PH16.htm
Personal satisfaction is thrown in for free.
Of course you won't be able to brag to anyone about what a great deal you got for $3000 from the name brand.