1968 RCA BW Sportabout 19"

[dieseljeep]

Originally Posted by Findm-Keepm

Ditto on what Zeno says - classic shorted yoke, horizontal winding or one or both vertical windings. We used to see this quite often here in southeast Virginia - humidity in the summer would kill yokes. Our countermeasure was a good coat of Humiseal (kinda like spray polyurethane, but with acetate as the sealing agent). Lemme see if I have a yoke - KCS160 was a popular chassis, so finding one should be easy.

Yokes of that era used some kind of a nasty type cement, that humidity would cause it to eat though the enamel on the wire. I looked like black crumbly stuff.
Just about every yoke failure was caused by this and not just the RCA yokes. Other makes, as well.