[sandbar40]

When restoring another brand radio, i found a Philco branded filament transformer used to step up 2.5 volt to 6.3 volt.
This radio was originally all 2.5v tubes, but someone had replaced  some with 6.3v types, hence the trannie.
Unfortunately, when i restored all tiubes to 2.v i didn't note how the trannie was connected.
So, can anyone tell me if this was an auto trans or?
It has 3 leads, is wound with heavy wire, laminations 5 cm  x 4 cm x 1.5 cm.
On the top, PHILCO
                  reg us pat off
                32  7019 M