Re: Vintage phone won't ring on house wiring
- From: Jock Mackirdy <jock.mackirdy@xxxxxxxxxxxx>
- Date: Sat, 29 Jul 2006 15:51:30 GMT
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.
--
Jock Mackirdy
.
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