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Seven houses on one 25 KVA transformer ? Where I live in the midwest your house has to have 100A service 100A*240V=24Kva.

Have you tried Heyco they make similar items. http://www.heyco.com/

I agree with Billm1 I use a local (Indiana) medium size shop that charges me 80-120 USD/Hour depending on difficulty of the job. There is a small shop here also for very simple jobs that charges $30/Hour

I am looking to get some transformers repaired in the Tulsa, OK area. Any suggestions

Try these guy's. I've gotten small quantities from them in the past. http://www.rubadue.com/

Always fun to accidentally hook up big electrolytic caps backward soon followed by a loud bang and confetti everywhere

I haven't done this in a while but look at Top Switch integrated circuits they are basically a switching supply on a chip.

Look for switching power supply designs they can easily handle this type of input variation.

A transformer rated at 48V 300VA at nominal input will have a nominal output at 6.25A. The no load voltage you mention of 52V is about right as 300VA transformers typically have regulation (Vnoload/Vfull load) of 8 to 10%. As the load is increased from 0 to 6.25A the output voltage will decrease...

Try digi-Key there about $0.33 each they have a couple of brands

The # E119932 is the UL file # for COPARTNER TECHNOLOGY CORP the manufacturer AWM is Appliance Wiring Material 20276 is the type of cable VW-1 means that it passes the UL vertical flame test

I belive the transformer you are using has an ungapped core, so each time you pulse it you increase the gauss level until it reaches saturation. To use a single ended(unipolar) pulse as an input to a transformer the transformer core must have a gap to prevent saturation or a very long off-time...