UK Vintage Radio Repair and Restoration Discussion Forum

UK Vintage Radio Repair and Restoration Discussion Forum (https://www.vintage-radio.net/forum/index.php)

- Vintage Telephony and Telecomms (https://www.vintage-radio.net/forum/forumdisplay.php?f=111)

- - 56C ringer. (https://www.vintage-radio.net/forum/showthread.php?t=151311)

dbrb222

11th Nov 2018 9:50 pm

56C ringer.

Hi.

I have a 56C ringer, of the two screws that connect the power, one has vanished.

On the assumption that it does not magically reappear, does anyone know the thread? It seems to be an imperial thread somewhere roughly equivalent to M4.

Neil1970

14th Nov 2018 11:20 am

Re: 56C ringer.

It might be a 3BA which is 4.1mm o/d or a 4BA which is 3.6mm o/d. If it's 3.6mm o/d you should be able to tap out to M4 or if it's 4.1mm o/d you might be able to tap out to M5 if it comes to it.

Dave Moll

14th Nov 2018 11:47 am

Re: 56C ringer.

More likely to be 3BA, as the GPO tended to use odd-numbered BA threads.

dbrb222

16th Nov 2018 11:51 pm

Re: 56C ringer.

Thanks - I've ordered £3.00 worth of 3BA from ebay - I'll confirm on here if they fit!

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