that horrible BEEP

[Bob Nelson]

Well, I meant the blip heard when they went to a commercial (network radio news)--which also could
be a series of two two-tone messages (musical notes, approximately: E-C...D-B...
But yes there is the TOH "bong" before the network radio news on CBS...
the "ding" I referred to was on TV, especially in prime time.

Example, from 1970s:
Saturday 9 pm (IIRC)
--Slide for Ch 7 Boston
--Ding!
--Start of theme song for "Maude"