[radio nut]

I recently acquired a home made 1 tube regenerative radio. It has a number 12 vacuum tube with a good heater and I am hoping it has good emissions.
The grid cap/resistor assembly is a freshman part that according to radio museum. Org is from 1923. One thing I am curious about is the tube, the base is large like a 201a and so far the pictures I have found of a 12 show a small base. But at the same time the socket it sits on doesn't seem to match a 12 tube. The socket shows pin 1 being heater minus,2 being grid,3 plate, and 4 heater plus. This matches how its wired compared to an online 1 tube regen set. However a 12 tube base is pin 2 plate and pin 3 grid . So far I can't figure out which tube matches this socket. So I am unsure if the 12 tube has been put on a different base or what.