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Vintage Telephony and Telecomms Vintage Telephones, Telephony and Telecomms Equipment |
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12th Jan 2016, 2:47 pm | #1 |
Dekatron
Join Date: Sep 2005
Location: Seaford, East Sussex, UK.
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Candlestick bell tinkle
Should I get bell tinkle from a candlestick phone? The bell is a Bell No. 1A now converted to a bellset using a 700 series induction coil but with the bell wired into the blue ringing circuit.
The No. 1A bell has no suppression and is extremely sensitive so maybe it is to be expected? |
12th Jan 2016, 3:31 pm | #2 |
Dekatron
Join Date: May 2008
Location: Derby, UK.
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Re: Candlestick bell tinkle
You will get bell tinkle from any kind of phone used on a line with individual broadband filters where another phone is dialling out in pulse mode. This is because there is no shunt across the bells anymore due to the separate ringing capacitors in each filter.
You can revert to "proper" 3-wire working (and thus, no more tinkling) by fitting a replacement faceplate to your NTE5 which is a "whole house" filter.
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12th Jan 2016, 4:53 pm | #3 |
Octode
Join Date: Mar 2011
Location: Sheffield, South Yorkshire, UK.
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Re: Candlestick bell tinkle
Do you mean that the new bellset is tinkling when you dial on the candlestick?
— Joe |
12th Jan 2016, 6:34 pm | #4 |
Dekatron
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Re: Candlestick bell tinkle
I have a DECT phone and the candlestick on the line. It is not enough to trigger the DECT bell but is enough to tinkle the No 1A bell. I have BT broadband so the master socket has the whole house filter. It doesn't surprise me that it tinkles as the dialler is a virtual short circuit on the line and the ring capacitor will discharge into the bell. I just wondered if this was 'normal'.
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12th Jan 2016, 6:43 pm | #5 |
Octode
Join Date: Mar 2011
Location: Sheffield, South Yorkshire, UK.
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Re: Candlestick bell tinkle
I've never had a 'proper' candlestick 'phone but have always wondered about this as they only have a single-pole gravity switch. Later instruments have an extra contact which shorts out the bell when off-hook.
That said, it's hard to believe that they tinkled back in the day. — Joe |
12th Jan 2016, 7:08 pm | #6 |
Dekatron
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Re: Candlestick bell tinkle
In my circuit I use the ring capacitor in the master socket but the Bellset No.1 uses the receiver isolation capacitor for both purposes. I suspect my problem is the receiver is shorted out when dialling which would also short out the bell coil. Looks like I need to exactly copy the N250 circuit.
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12th Jan 2016, 7:46 pm | #7 |
Guest
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Re: Candlestick bell tinkle
I 'cured' the tinkle on my (well her now) 746, to much surprise SHMBO liked it so the fix was undone.
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12th Jan 2016, 11:15 pm | #8 | |
Nonode
Join Date: Oct 2014
Location: West Midlands, UK.
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Re: Candlestick bell tinkle
Quote:
1) - feed external line via a 2w line direct ( or through several sockets on dedicated connected pair) to a slave socket beside computer . 2) connect a filter to socket, and PC via cat 5 and then a second socket( I always used a double individual master, with one side set up as slave) . 3) Phone side of filter is connected to 2/5 of master, and house wiring connected to 2/5 & 3 of master, and back to rest of house. No unsightly filters sticking out of sockets. True plan 1A wiring, and the world is at rest. BUT beware, the BB agents in other parts of the world. Their computer scripts say "all sockets MUST have a filter or all will fail". |
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13th Jan 2016, 2:01 pm | #9 |
Dekatron
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Re: Candlestick bell tinkle
Bellset No.1 N250 wiring looks like the answer. When off-hook and dialling, the bell ends up in parallel with a series connection of the primary and secondary of the induction coil. I had wired it as if it were a separate Bell No.1A which would always have had a tinkle issue. I will rewire it tonight and report back.
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13th Jan 2016, 3:57 pm | #10 | |
Octode
Join Date: Aug 2005
Location: Saltburn-East, Cleveland, UK.
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Re: Candlestick bell tinkle
Not quite Plan 1A more "new plug and socket", but as good as and, to be fair I'm not 100% certain whether BT re-designated the plan number as Plan 1A or Plan 4 for three wire PST extension systems when it was introduced.
Quote:
Regards Andrew |
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14th Jan 2016, 10:05 pm | #11 |
Dekatron
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Re: Candlestick bell tinkle
The N250 wiring has fixed the bell tinkle on dial. Now just a tinkle when picking the phone up.
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14th Jan 2016, 10:25 pm | #12 |
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Re: Candlestick bell tinkle
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14th Jan 2016, 11:13 pm | #13 |
Dekatron
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Re: Candlestick bell tinkle
... and if they did, bells were supposed to be wired in series.
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15th Jan 2016, 12:27 pm | #14 |
Dekatron
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Re: Candlestick bell tinkle
Does this mean the Bell No.1A would have been wired into a Bellset No.1?
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16th Jan 2016, 2:01 pm | #15 | |
Heptode
Join Date: Jul 2007
Location: Flintshire, UK.
Posts: 707
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Re: Candlestick bell tinkle
Quote:
Note that when the Tele 150 was used on a Plan 1A, there was only one Bellset No 1 with the induction coil, capacitor and bell - the extensions only had a Tele 150 and a Bell 1A (with switch to short out the Bell 1A when you didn't want it to ring) The attached diagrams are not on Sam Hallas' website. Ian CNet 0352 2345 |
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