Author Topic: AT&T Payphone Plus  (Read 523 times)

Offline NikeTelephone

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AT&T Payphone Plus
« on: April 24, 2017, 03:54:59 AM »
Heres my Private Payphone Plus, Got the manual off line, Says it Take 24 Volts, 

" Make sure the color of each small wire attached to a labeled connector on the
power supply board corresponds to the same color of wire and label on the
terminal block of the power transformer:
red and yellow wires to CT
- green wire to L1
- black wire to L2 "

Im guessing this is a Special Power supply, wondering if i could use a 24 volt with just plus and minus, not sure where to hook up the wires...

Thanks!
« Last Edit: April 24, 2017, 03:58:22 AM by NikeTelephone »
Phones, Who Knew! :)

Offline timmerk

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Re: AT&T Payphone Plus
« Reply #1 on: May 31, 2017, 11:25:18 PM »


Is the official transformer (courtesy of Mike's Vintage Telephones). It's a "24v AC center tapped capable of 830 ma (20VA) output." (courtesy of Ken Layton) It needs to be center tapped to have the correct outputs for the power supply.

Attached is the power supply and transformer of one of my Plus payphones.

Happen to get the CoinSoft and CoinRate software? I've been patiently waiting on a member of these forums to upload, but in the mean time, I thought I'd ask since I've been searching for 8+ years for this software.


Offline timmerk

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Re: AT&T Payphone Plus
« Reply #2 on: May 31, 2017, 11:31:43 PM »
Oh, also, as Jim (Payphone Installer) mentioned: replace the AT&T handset if it has an uninsulated handset cable through the middle. The cable in the AT&T handset always comes in contact over time with the conductors in the handset and burns out the power supply. This happened on my old high school Private Plus. I repaired the power supply, but the main board was already toast. :( Luckily, I still have two new Private Pluses left.

Alex G. Bell

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Re: AT&T Payphone Plus
« Reply #3 on: June 01, 2017, 10:45:30 AM »
Heres my Private Payphone Plus, Got the manual off line, Says it Take 24 Volts, 

" Make sure the color of each small wire attached to a labeled connector on the
power supply board corresponds to the same color of wire and label on the
terminal block of the power transformer:
red and yellow wires to CT
- green wire to L1
- black wire to L2 "

Im guessing this is a Special Power supply, wondering if i could use a 24 volt with just plus and minus, not sure where to hook up the wires...

Thanks!
Most likely not.  Some devices use low voltage AC power from a transformer because they use the AC to derive other voltages or sometimes, to run a time-of-day clock.  A DC supply will not work if they do this.  A 24VAC CT transformer with 20VA rating is the most generic thing.  Does not need to be a wall wart if you are able to make safe input and output connections.  But I think AT&T external modems used similar transformers, so finding a wall wart may not be so difficult.
« Last Edit: June 01, 2017, 10:50:58 AM by Alex G. Bell »

Offline trainman

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  • Posts: 485
Re: AT&T Payphone Plus
« Reply #4 on: September 15, 2017, 04:35:36 PM »
My plan was to find a 24v ac ct transformer i can get from most electronic supply hpuses