In the past I had an SA-9 and a rare SA-9 "junior" built for me by Mike Elliott. Mine worked regularly in these years and unfortunatly I no longer have schematics in order to help you but I know that in late years of Activity held by Mike Elliott under the brand "Altavista audio" all replacement and upgraded Transformers have bene made by Plitron in Canada.
I Will search in my papers if I can find exact code and values. May be useful for you.
I got Michael to repair and update my SA-9 years ago. Should have replaced the Transformers then. I think I have the schematics but need to check. Don't know about the Plitron part number though.