National Union 01A Vacuum Tube (UX 201A 301A) Dated 1937. Used. Tested Good.
It is marked “Made in USA” on the glass. It has a sticker on the glass from Dan McGrew Radio Service in Bellingham, WA. The label shows a test date of 3/21/1937. I tested the tube on my TV-3B/U tester where the minimum test for a good tube is 460gm.
