[Boatanchors] Boatanchor Question

[James Cundiff]

Hello All,
    This might be a little wide in the bandwidth but I don't know who to 
ask. I just acquired a Michigan Radio Co. 1 tube AM broadcast regen. 
radio. The radio is missing the 4 pin tube. Anyone out there know which 
tube this might use? There is no model # on it or schematic. If anybody 
has any of this info, I would be grateful. Thank you and 73.

In His service,
Jim Cundiff KB3GFC