Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!lll-winken!telecom-request From: wb8foz@mthvax.cs.miami.edu (David Lesher) Newsgroups: comp.dcom.telecom Subject: More About Selective Ringing Message-ID: Date: 23 Mar 91 16:50:17 GMT Sender: Telecom@eecs.nwu.edu Reply-To: David Lesher Organization: NRK Clinic for habitual NetNews abusers Lines: 52 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 11, Issue 232, Message 2 of 11 Donald E. Kimberlin suggested that changing the capacitor in tuned ringer phone will change its response to other frequencies. I hate to object to his statement when the rest of his submission was full of great telco history, but, according a friend of mine, who did extensive magnetic (i.e. ferroresonant transformers) design work AND also collected telephone equipment: The cap does NOT set the response of a mechanical ringer; rather it's done in the armature/coil design. I can only add a story of my own. One day, the Big_Boss brought in this old piece_of_junk 500 set, and complained it would no longer ring. Well, I hooked it up to my Subcycle, and sure enough, it hmmmed a little, but no ring. Ah_ha, I thought, bad cap in the 425K network. So I got the cap off of an old E1, and put it across A & K. Same thing. Well I asked the Big_Boss WHEN it stopped ringing, and got an evasive answer. Turns out it was his mother's, and I guess he was catching hell for not being able to fix it. So then I took a stab in the dark, and said, "She used to have a party line, before she moved. Correct?" He, at last, admitted such. I told him to find another ringer, and I'd install it. He did, I did, and his 90 year old grandmother was happy with him. Me? I kept the tuned ringer, and gave it to friends for their telephone museum. When you looked at the ringer, the magnetic shunt was cut. sssssssss s s cccccc s cccccc s cccccc sx cccccc x cccccc sx cccccc s cccccc s cccccc s s s sssssssss where c is the coil, s the shunt, and x a piece of much thinner material spot-welded around the gap. By the way, there is another Ohio name to add to the saga. C. P. Stocker designed the first magnetic 60-20 hz converter, called it the Sub-Cycle, and founded Lorain Products Inc. just west of Cleveland. They also made no end of telco power equipment. I recall hearing about a 5000 amp, 9 volt supply. Think how many Walkmans THAT would run.