Re: Vintage phone won't ring on house wiring


"Martin" <not-for-mail@xxxxxxxxxxx> wrote in message
news:517606B6-E4E8-4EC1-AC8A-528C5ED2E8DA%not-for-mail@xxxxxxxxxxxxxx
| Jock Mackirdy <jock.mackirdy@xxxxxxxxxxxx> wrote:
|
| > In article
| > <5D9602B0-0333-4A4F-93E6-6599D0E3781A%not-for-mail@xxxxxxxxxxx>, Martin
| > wrote:
| >> I have a 1957 GPO type 314 Bakelite telephone, which I suspect has
| >> shown up a fault in my house extension wiring.
| >>
| >> The vintage phone rings OK if:
| >> - plugged straight into the BT master socket, or
| >> - plugged straight into a Sipura ATA300 VOIP gadget, or
| >> - plugged into either of the above via a BT REN booster.
| >>
| >> The vintage phone does not ring if plugged through the house extension
| >> wiring, even with all the other phones unplugged. BUT a modern phone
| >> will ring when plugged into any of the extension sockets.
| >>
| >> Guess my next step is to visit all the extensions, sketch the
| >> connections, and check for anything silly... But before I start, is
| >> there anything I need to know about getting vintage phones to ring on
| >> extension wring?
| >>
| >> Thanks for any info!
| >
| > Back to first principles (I feel a Strangman moment coming on)
| >
| > 1. By all means check your socket wiring - same colour to same numbered
| > pin on all sockets.
| >
| > 2. Has the internal wiring of the phone been modified for compatibility
| > with modern house wiring (most important that the bell is connected to
| > the correct line wire plus the ringing wire). Remember that old phones
| > have a condenser (we are talking bakelite here!) with multiple functions:
| > bell isolation plus anti-bell tinkle plus dial spark suppression. You
| > must rewire according to the "approved" (not by BT!!!) diagram. It's no
| > good just sticking a modern line cord on in place of the old one.
| >
| > 3. (doesn't affect whether the bell rings but will affect other phones on
| > the same line) Have you inserted a large (at least 1 Kohm) resistor in
| > series with the bell windings? If not, this bell will hog all the ringing
| > current and other phones may not ring. Depending on how the phone has
| > been wired the bell may be sitting across the line all the time and
| > attenuating speech.
| >
| > 4. Was the phone wired up as a DEL in the first place? ISTR the 314 was
| > designed for various plan numbers so your one may not have bog-standard
| > DEL wiring. E.g. it may have been wired for shared service.
| >
| > I'm not suggesting that your phone has fallen into any of these traps.
| >
| > And finally, don't complain to BT if it doesn't work. 300-series phones
| > were never designed to work through modern sockets.
|
| Thanks - all good points and potential causes of problems. Happily it seems
| to be working OK now, after supplying pin 3 and 4 from the master socket. Now
| I just have to find out why the last socket in the chain won't ring the phone!
|
| I did take a look at the phone wiring. It bears some similarity to the
| description given in How to wire your Telephone No. 314 to make it work on
| Plug and Socket - though some of the connections are not on the same terminal
| numbers. It would help to have the circuit diagram - there must be one
| somewhere, as the volume and quality of vintage phone info on the web is
| excellent generally.
|
| Does anyone know whether the ringing cadence was the same in 1957 (when this
| example was made)? I'll be connecting it to a VOIP box eventually, on which I
| have the option of setting the ring cadence. It would be nice to set a period
| ring, if the ring then was any different to what it is now!
|
| Thanks to everyone who replied.
|
| - Martin.
|

The ring cadence would have been dependant on the Frequency and Voltage of the
ring signal.
I'm sure there are some old 'rings' out there as sound files someplace.


.

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