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Old 6th Dec 2019, 8:20 pm   #1
john777
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Join Date: Sep 2015
Location: Margate, Kent, UK.
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Default Problem with vintage dial 24c on Bakelite 332 phone

Hi everyone
I am having a problem trying to get a type 24c AEG dial to work with a 332 Bakelite phone.
The symptoms I get when I wire the dial in are: There is no dial tone, and if you ring into the phone the bells ring but if you pick up the receiver the bell doesn't stop ringing.
I have tried this on a working phone so know it must be the dial that is the problem.
Everything mechanically seems OK, I have cleaned all the points and they seem to be working OK and the dial is quick enough returning.
I am wondering whether it is wired up correctly, as it is set out differently to a type 10 or 12.
I have tried to wire it according to a standard wiring diagram but without success.
I am attaching a picture of the way it is wired now and just wondered if anyone knows whether this is correct.
Many thanks for reading.
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Old 7th Dec 2019, 12:53 am   #2
ajgriff
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Default Re: Problem with vintage dial 24c on Bakelite 332 phone

This is the dial commonly fitted to ITI (Indian Telephone Industries) phones. Have a look at this link:

https://www.britishtelephones.com/iti.htm

There is a photo of the circuit diagram half way down the page which might help.

Alan
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Old 7th Dec 2019, 6:27 am   #3
TonyDuell
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Default Re: Problem with vintage dial 24c on Bakelite 332 phone

I am pretty sure your wiring is wrong. The Blue and Slate (grey) wires should go to one of the off-normal contacts (to short the earpiece), they seem to be going to the impulse contats.

Silly suggestion. Try mirror-reversing the wires.
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Old 7th Dec 2019, 9:47 pm   #4
dagskarlsen
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Default Re: Problem with vintage dial 24c on Bakelite 332 phone

The diagram here: https://www.britishtelephones.com/gp...t322paster.jpg

indicates that the dial is wired wrong.

Tony has spotted it, that will make it work!

dsk
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Old 7th Dec 2019, 9:51 pm   #5
john777
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Default Re: Problem with vintage dial 24c on Bakelite 332 phone

Yes the wires were in the reverse order. Re-did them and it worked perfectly.
Seems like quite a nicely engineered dial. Made in Liverpool back in the days that we used to make things in the UK.
I attach a photo of the dial wired in the correct order.
Thanks all for the advice.
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Old 8th Dec 2019, 6:59 pm   #6
Pellseinydd
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Default Re: Problem with vintage dial 24c on Bakelite 332 phone

Quote:
Originally Posted by dagskarlsen View Post
The diagram here: https://www.britishtelephones.com/gp...t322paster.jpg

indicates that the dial is wired wrong.

Tony has spotted it, that will make it work!

dsk
The diagram above shows a PO 'Dial No 12' fitted not a 24C. The GPO didn't use the 'Dial 24C' which was a AT&E description. The circuit diagrams don't show the layout of the terminals - which are shown on the attached diagram.
Note that terminals are numbered in the opposite direction on the AT&E dial to the GPO ones. GPO number clockwise and the AT&E dial anti-clockwise for the relevant contacts.
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