Author Topic: Check out this Barn Find! (a Kellogg 900 Masterphone and subset)  (Read 441 times)

Online dsk

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Re: Check out this Barn Find! (a Kellogg 900 Masterphone and subset)
« Reply #15 on: November 03, 2017, 02:56:38 AM »
To the experts here, Kellogg 900 was used on magneto, and CB some had ringers in the pone, did they all have ringers? Was it different induction coils, or just changing some wires?

Do you have links to various schematics?

dsk


https://gyazo.com/431d70436eecb54dd7c7f1a564a020ed
« Last Edit: November 03, 2017, 03:56:40 AM by dsk »
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Online dsk

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Re: Check out this Barn Find! (a Kellogg 900 Masterphone and subset)
« Reply #16 on: November 03, 2017, 02:00:19 PM »
If you post the schematics, hopefully glued in to the subset, you may get exact advice's. Since this probably are a phone used on short lines it will probably work well with a strange connection; Connect the line to the 2 battery terminals, and short the 2 line terminals. On CB manual board: Voice path should work OK, but no Ringing. To get rining a capacitor from the ringer terminal to one of the battery terminals, (not sure witch of them, you have to try) The capacitor should be a normal ringer capacitor probably rated at 1 microfarad, but test with whatever you have.

This is based on the idea of that you have a phone with noting else tan the hookswitch under the cover, and a regular Local Battery subset.

dsk
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Offline ramegoom

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Re: Check out this Barn Find! (a Kellogg 900 Masterphone and subset)
« Reply #17 on: November 04, 2017, 06:19:49 PM »
I think I have it working correctly. Added a small 3 volt DC supply inside the switchboard and tied it into an unused pair of wires, out to the phone. Then I tied the trunk Line 1 into that connection. I have a 15 volt DC supply feeding this small module. The other supply is a ring generator that bypasses the hand crank.

When I crank the magneto on the phone, the trunk line 1 lamp lights and stays lighted. Plug the jack in, the phone is active.

Further testing will determine if it works 100%. Here's the power supply I added: