[rontech]

My parents had a low voltage electric blanket bought about 1947. Made by a company called Windak in Poynton Cheshire. They had made electrically heated flying suits during WW2 and turned their expertise to the domestic market afterwards. There was a very heavy transformer unit with a 4 way rotary switch off/low/med/high.

Later they bought me a single bed version. By the 1970's I ended up wth both transformer units. One I gave away and the other I converted to a car / motor cycle battery charger ( 10 amp solid state bridge rectifier ) + car ammeter in the place where the rotary switch had sat.

Just recently have converted the unit to a high current AC only source with 5 x 4mm output sockets. Ground 4V / 8V / 16 V / 24V ; from tappings on the transformer. Fitted ON/OFF toggle switch and an internal fuse. Resprayed the case in dark grey metallic.

The transformer was labelled "Davenset" who I think were a manufacturer of battery chargers.