Rewind and Repair of Large Toroidal Transformer

[SgtRock]

Greetings EEVBees:

--I just came across this fellow "feedbackloop". In the attached video he unwinds, repairs, and then rewinds the main toroidal transformer, and fixes an Array 3664A bench power supply. Now it did take a bit of work, but nothing difficult. If you happen to have a similar power supply, or even an expensive audio amplifier, with a toroidal main transformer, this technique could save you a ton of money, an allow you to keep a valuable piece of equipment rather than trashing it. I hope this will be of help to someone.



"I believe that at the end of the century the use of words and general educated opinion will have altered so much that one will be able to speak of machines thinking without expecting to be contradicted."
Alan Turing 1912 - 1954

Best Regards
Clear Ether

[SeanB]

I have rewound transformers and motors, and it is doable, if somewhat fiddly. Have never done toroids other than making current transformers out of them.

At least in the video a secondary side short is easy to get at, though you will need a lot of tape to rewind it if you are going to do so.  Myself if it is a secondary short and it has those insulating washers just leaving bare is how it will be.