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Eliot this is the innards of that Trim phone prototype the next picture shows a close up

Eliot this is the innards of that Trim phone prototype the next picture shows a close up

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The inside of a early Trim phone. This one is heavier and will not skate across the surface.

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Date added:Feb 01, 2014
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SuperSix
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ATL P42STUFF supersix94
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Feb 01, 2014 at 12:18 PM Author: SuperSix
Fantastic Peter, extremely rare! Does it have the GPO model number 712 stamped on the bottom?

Would be interesting to get it wired up and see if it all works. I've been told problems with the ringers can be common with these prototypes although mine seemed to work well when I tested it!

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Feb 01, 2014 at 12:43 PM Author: migette1
The number is 66 lau 60aab and yes the tone ringer does not work will have to have a little look as I have the normal one so maybe able to substitute. bits. Got this from my favorite bootsale at Wimbledon dog track cost me a fiver or there abouts Eliot

Interested in the history of electric lighting and incandescent in particular and neon glow lamps.

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Feb 01, 2014 at 01:11 PM Author: rjluna2
Do I spy a tube in there, Peter?

Pretty, please no more Chinese failure.

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Feb 01, 2014 at 01:42 PM Author: migette1
Yes its a barreter of sorts used in the tone generator and on the other side is a thermistor used to control ringing current (I think) you have good eye sight Robert.

Interested in the history of electric lighting and incandescent in particular and neon glow lamps.

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Feb 01, 2014 at 01:55 PM Author: rjluna2
Thanks, Peter

Pretty, please no more Chinese failure.

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Feb 01, 2014 at 01:58 PM Author: SuperSix
Same as mine then. Quite an early example, before they were even used in Post Office trials. Manufactured by Standard Telephones and Cables and know as the model Deltaphone. That's a really incredible find for a carboot sale!

I'd say the first thing to test would be the thermistor if the ringer fails to operate, I've seen a couple in earlier models that have failed. It's used to prevent nuisance 'chirping' of the ringer from pulses on the line and also gives the function of gradually increasing the ringer volume. You can safely put a link across the terminals for testing.

Atlas Lamps - Seeing Is Believing!

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Feb 01, 2014 at 02:15 PM Author: migette1
Thanks Eliot you have excellent knowledge of these I remember when they first came out, I worked for GPO which is now BT and I think this was the first tone ringer telephone. I will certainly check that thermistor why didnt I think of that. BTW how do you get into the handset there is no visible screw??? Hey dont miss the comms fair this year must find out the date and put it up. Have you seen the Rotary Phone web site, very good.

Interested in the history of electric lighting and incandescent in particular and neon glow lamps.

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Feb 01, 2014 at 02:26 PM Author: SuperSix
Thanks. Yes I think they were the first telephone over here with a tone ringer. A really revolutionary bit of kit at the time!

Getting into the handset is a bit tricky. I've never done so myself for fear of breaking it but I did take it to the fair in Warwick a couple of years back for advice and someone showed me how. It just pulls apart at the top but the bloke who showed me had to use some force! I couldn't bare to look as there's already a small crack in the handset and I thought he was going to break it!

Atlas Lamps - Seeing Is Believing!

http://www.youtube.com/user/P42STUFF

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Feb 04, 2014 at 02:40 AM Author: migette1
Still having a look into why the tone does not work thermistor ok but something is shorting out the ringing current, will let you know when I have sorted it out, thanks again Eliot.

Interested in the history of electric lighting and incandescent in particular and neon glow lamps.

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