Hi: A neighbour was cleaning out his deceased Father in law's house. The old boy kept all his stuff from when (I guess) he was a TV and electronics repairman in the tube days. He asked if I could sort through the 5 boxes of tubes, sockets, and books in exchange I get to keep enough stock to build my own amp. Being only familiar with bjt and chip projects, I need some help with what is actually worth keeping. There is about 4-500 tubes , new in boxes. In one of the books (from GE) it lists essential characteristics of most tubes that I have in front of me. Is it safe to say that all listed for service in class A amplifier are the ones I should keep?