I recently acquired a box of components from a ham that built a lot of Heathkit gear. He had shelves full of finished kits, spare parts, etc. In my box of goodies were two Fetrons, a TR1002 and a TR1119. I know these were sold by Heathkit as drop-in replacements for the 6AL5 and 12AU7 (I think) in one of the VTVMs. Wondering if anyone has a schematic of these? I've been searching the web and finding references to them but not a data sheet or specs. While I don't have a Heathkit VTVM, it would be fun to figure out how to do something with them.