[Nadanutcase]

OK - thanks for the feedback so far. I have contacted Heyboer to get started on a replacement transformer.

Meanwhile, it seems that the transformers in this set are somewhat unusual in that they have a jumper to select 115 or 230 V operation, so for anyone who is curious, I've posted a few pictures.
First here's the chassis in the radio:

http://i791.photobucket.com/albums/yy193...49cdec.jpg

Here's the part number (again - this does show as an option on the parts list, but the schematic I have doesn't reflect the jumper option):

http://i791.photobucket.com/albums/yy193...9eb051.jpg

Here is the voltage programming jumper. You have to remove the cover to see that it's an octal plug that can be rotated to select the input voltage:

http://i791.photobucket.com/albums/yy193...ad65ab.jpg

And, finally, here's a shot of the cripsy leads and a rectifier socket that has been replaced AND that's not wired correctely for the original 5X4 rectifer:

http://i791.photobucket.com/albums/yy193...b16b7a.jpg

I have no history on this set. Here is my best GUESS as to why it was set up for dual voltage operation: Our club (the Iowa Antique Radio Club and Historical Society - http://www.iowa-antique-radio-club.com) holds an auction each Spring that draws people from around the midwest, including some regulars from Minnesota. A couple years ago one of them brought this set to the auction and I bought it. I have no way to know, so I'm guessing that this set may have been originally sold near or in Canada where 230 volts line voltage was in use.

Does this forum include anyone from the Maple Leaf country that can shed any more light on that ??

Dave