Western Electric 336A Tube,105,106 Preamp

Western Electric 336A Tube This is a single 336A The tube is an early type with Western Electric and the 336A marked on the top of the tube. They were used in Western Electric 105 and 106 preamps.
The former owner tested it with a TV7 and it tested 38/16. I tested it with a Conar tester and it tested strong.
The tube is Black plate.