I have a large group of Bud coils, is there a cross for the B&W?
They are identical, electrically and mechanically. I have found them to be
completely interchangeable.
If you can find a 1943 ARRL handbook, plus or minus a couple of years, they
feature some homebrew transmitters, and describe the coils, which are exact
replicas of the B & W coils. E.F. Johnson and National also made these
coils. The Johnson ones are interchangeable with the B & W's. I am not
sure about the Nationals. Millen may have made them too.
I have found the B&W's to be the worst ones to self-destruct when the
plastic disintegrates with age. I have some Bud's that are still pristine
despite decades of use. B&W evidently used a different plastic (cullulose
acetate) from the others. It may be a very good dielectric, but it
eventually disintegrates with age.
Don K4KYV
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