philco 1y1 tube use and testing

[fumplet]

Hello I bought this tube off ebay just because Ive never seen one look like this before. Im hoping it glows like other current regulator tubes Ive seen but not sure how or what to test it with. I didnt see a tube category like on the ARF so I hope IM posting in the right spot. Not too much info I found on this tube other than a ballast tube book but that doesnt show test circuits for it.