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Old 14th Feb 2018, 6:21 pm   #25
radiotechnician
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Join Date: Jan 2013
Location: Powell River, British Columbia, Canada.
Posts: 217
Default Re: Kellogg wall phones - need help

Quote:
Originally Posted by ct92404 View Post
Dags, thank you for drawing that schematic! That definitely helps!

I had another quick question - in general, how reliable are the capacitors in these old telephones? Should I replace it? When I've worked on antique radios, I usually had to replace several capacitors, especially electrolytic filtering ("smoothing") caps and wax ones. If I do replace the capacitor, I'll leave it installed for historical purposes and just clip the wires and put a new cap across them. But should I bother with that, or do you think the original capacitor might still work?

Oh, and I just tested the ringer. I hooked up one telephone to the other...when I cranked the first one, the bell rang on them both! So at least I'm getting there!
The set is provided with an anti sidetone network, and a 6 bar magneto.

This phone is used on long, or populated lines. The network is a bridge
which has an arm that is the line.

Whatever the specifics of the original capacitor, the phone company
would have matched the capacitor. Pacing a new capacitor, with a radically
different D factor, will alter the sidetone.
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