Vacuum tube type UX281
Radio Corporation of America (RCA)
||Stamped into base
overall: 6 in x 2 1/4 in x 2 1/4 in
This A Radiotron tube is not cylindrical in shape. It is narrow at the bottom and is wider at the top. There are four pins on the base. "Open fil." is handwritten on tape attached to tube.
Gift of Gary Papazian