Up for sale here is this large vintage 901717-501 transformer.  This is a pretty neat one!  I have no idea who made it, but I have a few others like it, and they are all listed.  

This is marked as having primaries at 105v, 115v, and 125v, and secondaries at 3.75v and 7.5v.  It is tested and works fine.  The secondaries test a bit high, possibly since it's unloaded.  I don't know the current specs, unfortunately.  This is tested good and is guaranteed to work for you.  Please see my pictures for details and dimensions.

US shipping and handling is $15.  If you have any questions, please ask.

I have more transformers and other vintage electronics listed--feel free to take a look!