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RE: Williamson revisited

I'm doing something similar, converting Heathkit W5M to Radio Craftsman 500 circuit, both of which are Williamson designs. I found some OPT 12Kohm transformers from the 50's that were originally shipped from BBC to someplace in Italy and sat in a crate all this time.

I just got the first one running today. Sounds good on the bench, I will get a better idea when I get the other one completed. It has been a fun project, there is still quite a bit of information on this old design.


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  • RE: Williamson revisited - fredtr 06/5/2017:29:24 06/5/20 (0)

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