Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!texbell!vector!telecom-gateway From: john@zygot.ati.com (John Higdon) Newsgroups: comp.dcom.telecom Subject: Re: Precise Dial Tone & A Tone of the Past: No-Such-Number Message-ID:Date: 25 Sep 89 21:36:12 GMT Sender: news@vector.Dallas.TX.US Organization: Green Hills and Cows Lines: 21 Approved: telecom-request@vector.dallas.tx.us X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@vector.dallas.tx.us X-TELECOM-Digest: volume 9, issue 406, message 2 of 12 In article , kitty!larry@uunet.uu. net (Larry Lippman) writes: > Interestingly enough, with one exception, I have never seen > nor even heard of a call progress tone generator which used vacuum > tubes. Technology in this area went directly from the > electromechanical to the solid-state. The one exception was the > "no-such-number" tone generator, which used vacuum tubes and made its > debut around 1940; it has been affectionately called the "crybaby > tone". The dial and busy/reorder tones in a stock Stromberg XY are generated by a device which uses a single vacuum tube. Ringback comes from a vibrating reed device (and sounds like a fart). The sound made by the dial tone generator is reminiscent of the old WE SXS "honker" tone but has a more mellow timbre. Although rapidly disappearing, the California desert is peppered with exchanges using the XY. John Higdon | P. O. Box 7648 | +1 408 723 1395 john@zygot.ati.com | San Jose, CA 95150 | M o o !