[Boatanchors] Low pass filter for Heath SB 10

[john w. king]

There was a magazine article in early 1960s that described a low pass audio
filter for the Heath SB 10. i built it and it was very effective. Now I have
another SB 10 and am looking for the magazine article which I haven't been
able to find. Don't remember which magazine or which issue it a[[eared in.
It used two TV horizontal linearity coils and a four capacitors and was
adjustable with the coil slugs.

Does anyone remember the article and circuit? I have a great library, but
can't locate the article. I am not sure if it was in QST, CQ, or 73. If you
know where the article is, please advise. 73, John, K5PGW