I purchased two NEW production A-470's from Kevin at Dynakit for a unit that was built from the ground up. I can honestly say that the output trannies I got from Kevin are every bit as good as the old cloth lead outputs. I have rolled various tubes in and out of my scratch built unit and the old refurbished units that have cloth lead A-470's, and I cannot tell any difference whatsoever from Kevin's transformers and the old cloth lead transformers. Kevin's transformers are excellent.
Given the age of the old transformers with the cloth leads you gotta say they were extremely well built to be around half a century later still working flawlessly. There's not too many things made these days that can compare with that kind of workmanship I think. I am certainly willing to stick my neck out and say that Kevin's output transformers will be around in 2050 in my scratch built amp and my grandkids will be selling them for big money on EBAY LOL.
Don't hesitate to use Kevin at Dynakit to source output transformers. They work excellent and mine have never even gotten warm. Seriously these transformers run cool all the time for me. Offer Kevin a few extra bucks and I bet he will get some nice brass hardware for you, really looks good with the KT66 Gold Lion's by the way... :}