Lo and behold, there is
a custom winder in Las Vegas - Electa-Print.
I didn't know that until this morning. Their prices are higher than Edcor, but they will build a massive
PP output transformer for $380USD.
I asked for a price on an OT with the same specs as an Edcor model and here was a part of the response I got which I found interesting:
"The core size in a p-p type trans is really affected by the power output at the bass end. Wire DCR losses are of no concequences just put up with (them). We can build this very large so it could supply very high power at the low end, or reduce the size and you would use NFB to artificailly produce bass.
The larger, the less NFB needed, also the price increases for large cores.
The reason we do not have p-p models is due to the NFB value which is unknown to the customer and we have to guess for them.
When the bass end is lousy we are blamed so no stock models."
I'm going to write them again and find out just how big the cores are and how much the transformers weigh. I've always been a little "fuzzy" on how PP transformers are rated for power. There are no standards of measurement to make a uniform comparison. Many manufacturers rate the response and distortion at partial power, with no indication of the way the measurements were taken. To me the weight of the transformer has more to do with the power rating than the specs that the manufacturer can manipulate at will.