UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

joebog1 · 3rd Dec 2022, 11:20 pm

I suspect the Epoxy they used will be Glyptal, and if the transfomer was baked after it was impregnated it will be a proper ^%(*&% to pull apart.
Dougie's quote doesnt say if it was vacuum impregnated or just dipped, but after all these years I suspect the varnish will have set like concrete. If the transfomer was properly vacuum varnished I wouldnt even try.
I would be tempted to buy an 240 - 120 stepdown transformer and leave it at that.
As far as running at 50 Hz rather than 60 the transformer will handle that OK, albeit a little hotter than it did on 60 Hz. You could add some vetillation additions to the case to remove the heat. Even a small fan similar to that used on a PC video card will be more than enough, and if you run it at half voltage it will be very quiet indeed.

Joe

3rd Dec 2022, 11:20 pm	#7
joebog1 Banned Join Date: Jun 2015 Location: Mareeba, North Queensland, Australia Posts: 2,704	Re: Rewind Dynaco mains Tx for 240V I suspect the Epoxy they used will be Glyptal, and if the transfomer was baked after it was impregnated it will be a proper ^%(*&% to pull apart. Dougie's quote doesnt say if it was vacuum impregnated or just dipped, but after all these years I suspect the varnish will have set like concrete. If the transfomer was properly vacuum varnished I wouldnt even try. I would be tempted to buy an 240 - 120 stepdown transformer and leave it at that. As far as running at 50 Hz rather than 60 the transformer will handle that OK, albeit a little hotter than it did on 60 Hz. You could add some vetillation additions to the case to remove the heat. Even a small fan similar to that used on a PC video card will be more than enough, and if you run it at half voltage it will be very quiet indeed. Joe