"Fish Paper" or Cambric Woody. It's avalable from antique radios supply houses. http://www.amazon.com/Fish-Paper-Insulating-Cotton-Thick/dp/B000FMUG2A or http://www.professionalplastics.com/FISHPAPER or part number S-M560 at http://www.tubesandmore.com/
The Cambric is like a thin G-10 material but impregnated with varnish instead of resin. The Fish Paper is a pressed paper material.
Denny Graham
Sandwich, IL

Last edited by Denny Graham; 06/02/2010 2:03 AM.
Denny G
Sandwich, IL