[radiomikee]

I would not go for a custom wound transformer, that is not necessary. You can purchase a new Hammond center tapped output transformer with a 5-7 watt rating and place it right inside the metal casing of the original output transformer, and re mount it right back on the frame of the speaker. Ihave done this many times with Philco 70 speakers. You have already drilled out the rivets to get the transformer case off; use some machine screws to remount it after rewiring the new leads to the correct points. It works great and costs about $20 or less. The Hammond product line as sold by Radio-Daze in Rochester, NY comes with frame dimensions (check the website) so you can get one that is the right physical size.

Mike AB3CX