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Old 31st Oct 2018, 12:11 pm   #1
D.Finney
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Default GPO 332 mk1 with modifications

This phone has a genuine 332 bakelite casing and appropriate handset with braided cord. The base plate of the phone is stamped "L11560C7" and "Special". The normal 332 wiring diagram is on the inside of the base plate.

The chassis is not a 332, it has looks more modern and is marked "812L 558/3A", it has a buzzer marked "32A/3 GEN/1" and a capacitor marked GEC A595 0.1 M250.

Has this ever been a viable phone made for special purposes or just a collection of odd parts?
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Old 31st Oct 2018, 12:59 pm   #2
Nickthedentist
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Default Re: Gpo 332 mk1 with modifications

The baseplate number suggests an ATM phone: http://www.britishtelephones.com/atm/l11560.htm

Very similar (chassis excepted) to my recent-ish charity shop purchase described here, which incidentally, is now our main house phone: https://www.vintage-radio.net/forum/...d.php?p=992414

Is the yellow thing the cap? If so, how is it mounted?

Nick.

Last edited by Nickthedentist; 31st Oct 2018 at 1:08 pm.
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Old 31st Oct 2018, 7:27 pm   #3
midshires
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Default Re: GPO 332 mk1 with modifications

The S58 markings indicate the internal sub-assembly was made by Siemens Brothers in 1958. So yes, it is a home-made assembly of odd parts. The wiring looks like a rat's nest (sorry!). It would have been bundled with lacing cord had it been an official modification.
Andy.
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Old 1st Nov 2018, 11:48 am   #4
D.Finney
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Default Re: GPO 332 mk1 with modifications

Thank you all for your advice, Nick, the yellow thing you can see is the PVC insulation on the buzzer coil, the capacitor is a small square black plastic type mounted on the buzzer.
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Old 2nd Nov 2018, 10:36 am   #5
giraffenigel
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Default Re: GPO 332 mk1 with modifications

The chassis is a 312 from 1958
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Old 2nd Nov 2018, 10:50 am   #6
Nickthedentist
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Default Re: GPO 332 mk1 with modifications

Yes, I think the "8" quoted in post 1 must in fact be a "3".

If it were mine, I think I'd invest in a replacement chassis c/w ASTIC and bell etc. They seem to crop up from various online sellers for surprisingly little.

Nick.
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Old 2nd Nov 2018, 12:45 pm   #7
D.Finney
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Default Re: GPO 332 mk1 with modifications

Thanks to all for your help and advice.
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