I "borrowed" this from "ZeeBee" Magnus' latest Clementine posting:
http://livinginthepast-audioweb.co.uk/transformers.php
UK source for transformers and parts, also some simple SE and PP tube amp schematics. The Home page includes other topics, which may or not be of interest.
http://livinginthepast-audioweb.co.uk/homepage.php
/ed B