Author Topic: Western Electric Preset dial telephone set  (Read 1874 times)

Offline paul-f

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Re: Western Electric Preset dial telephone set
« Reply #15 on: July 02, 2016, 11:53:00 AM »
Why do you think it was a field trial ?

I may be going out on a limb here, but the article shown above ends with:

    "The phone is scheduled for customer testing by the Bell System."

...and the phone is dated 5-66, which is before the article appeared in 7-66. It also has a serial number.

I do agree that it is possible that the F- number was used after the trial(s) if the phone was made in limited quantities.  In that case, there should be a BSP, as there is for sets like the F-58554-type Card Dialers.
« Last Edit: July 02, 2016, 11:57:39 AM by paul-f »
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Offline paul-f

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Re: Western Electric Preset dial telephone set
« Reply #16 on: July 03, 2016, 05:33:41 PM »
I had a few minutes today to look at the dial, and noticed that the assembly is held on by two screws, so was easily able to loosen it to get some other views.

As you can see, there are apparently coils for touch tone oscillators and there is a synchronous motor to handle the sequencing. It drives a wiper arm that contacts circular runs on a circuit board. It reminds me of some mechanical logic process control systems I worked on in the 1970s.

Unfortunately, the wires to the programming panel attach on the side of the circuit board that's hidden between two layers, so it will be difficult to determine the sequencing by inspection without disassembling a lot of stuff.

The next step will be to start working on a wiring diagram to see where the power and line should be connected.
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Offline paul-f

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Re: Western Electric Preset dial telephone set
« Reply #17 on: July 05, 2016, 07:20:16 PM »
Completed the first pass cosmetic work, including making a dial card (it's large), based on a photo received from the AT&T Archives.

  http://www.paul-f.com/weprotot.html#F56750
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Offline TelePlay

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Re: Western Electric Preset dial telephone set
« Reply #18 on: July 05, 2016, 07:24:39 PM »
Completed the first pass cosmetic work, . . .

Looks great and what's left to do? Looks finished to me.

Nice photo for your web site and that dial card is both unique eye catching. Great phone you snagged there.
            John . . .

              

Offline paul-f

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Re: Western Electric Preset dial telephone set
« Reply #19 on: July 05, 2016, 07:35:04 PM »
Looks great and what's left to do? Looks finished to me.

Thanks, John.

It is ready to display, but I REALLY want to watch the motor turn and see it dial a number.

That is waiting until I either find some documentation that shows how to wire it, or have the time to sort through the maze of wires to take a guess at where power and the phone line connect.

Unfortunately, the mounting cord is color coded as five pairs, without the usual hint of red and green for the line, etc.

I must admit, I'm having fun with this and it will be all the more memorable with a few challenges to overcome.
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Offline HarrySmith

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Re: Western Electric Preset dial telephone set
« Reply #20 on: July 05, 2016, 09:09:33 PM »
Very Cool! There must be some documentation somewhere, keep searching. It would be interesting to see how it functions.
Harry Smith
ATCA 4434
TCI

"There is no try,
there is only
do or do not"