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Old 16th Jan 2011, 7:04 pm   #1
ivanidea
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Default 232L bakelite telephone and No 26 Bellset

I am trying to set up the telephone and bellset.
The bellset was supplied as converted and has the 3.3K resistor fitted.
It has a cord fitted with a plug to go in the telephone socket. The white and blue connectors are connected to the bellset and a third connector has been cut off.
I understand the telephone has been converted and the handset is wired as per the internal wiring diagram.
My dilema is I have no idea how to connect them both and what specification cord I need to join them together.
Does both the telephone and bellset have to be plugged into a twin socket?
Can you buy a cord with spade connections at each end, and is this what I should be doing anyway?
In other words is the two connected and only the bellset plugged in to the telephone line?
I play a pretty good game of snooker, but have limited knowledge of telephony.
Any guidance is going to be much appreciated.

Ivan Heads
County Durham
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Old 16th Jan 2011, 8:30 pm   #2
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Default Re: 232L bakelite telephone and No 26 Bellset

Hi,
The 232 and Bellset 26 (or other bellset such as Bellset no1, for instance) were intended to be used as a pair, with the bellset either mounted seperately or underneath the telephone, I am not sure if there was an adapter to allow the fitting of the bellset to the telephone though.
To get back to your original question, spade terminals are availble from Maplins but would have to be soldered on to any line cord that you intended to use.
Suitable line cords can often be found on e Bay

Much more information can be found about the 232 and bellset, including wiring details here and here

Regards
Andrew
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Old 17th Jan 2011, 6:20 pm   #3
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Default Re: 232L bakelite telephone and No 26 Bellset

Andy
I actually have a static caravan on Hazelgrove at Salburn and spend a bit of time there.
Thanks for your input.
What I am looking for is a fools guide to connect the two units.
I have progressed since my initial post to the point that when I connected the plug on the bellset attached to the phone as instructd in earlier posts, the following happened when I rang my number using my mobile.
The mobile displayed a message that call divert was active!
The bellset rang. On picking up the handset on the phone all that was audible was the ring, ring sound indicating a call was being attempted. On depressing the cradle this stopped and the bellset rang.
In other words I could not get a line on the handset from my mobile.
Would appreciate any suggestions.
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Old 17th Jan 2011, 8:48 pm   #4
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Default Re: 232L bakelite telephone and No 26 Bellset

Hello Ivan,

It may be possible to fix the bellset to the base of your 232L if you want, this is commonly known as a "King Pyramid" - it depends on the type of fixing screws that have been used to hold the bellset cover to it's base. That way you could use one of the short reproduction braided cords that are available to connect your 232L to the bellset.

A good write-up with photographs on how to do this is available here: http://www.britishtelephones.com/pyramidandbell.htm

How to wire the 232L to the bellset and then wire your modern line cord to the bellset can be found here about a quarter of the way down the page: http://www.britishtelephones.com/pstconv1.htm#232

Regards, Lee.
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Old 18th Jan 2011, 9:37 pm   #5
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Default Re: 232L bakelite telephone and No 26 Bellset

Lee
Am I pleased you got involved.
I had no idea that you could make it up to be a legitimate king pyramid.
I would have just stood the phone on the bellset.
I do not have the two screws mentioned, but as I am now committed to making up a king pyramid I will endeavour to obtain them. Failing that I can have them made.
The next step is to buy a cord and try to wire them up.
Do you know who supplies the cords and do you think I need anything else as I bought the phone on the basis that it was already converted to plug in.

On the link you gave me a rectifier was mentioned, which is new one to me.
Can you or anyone else cast any light on it?

Thanks
Ivan
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Old 19th Jan 2011, 12:44 am   #6
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Default Re: 232L bakelite telephone and No 26 Bellset

Quote:
Originally Posted by ivanidea View Post

On the link you gave me a rectifier was mentioned, which is new one to me.
Can you or anyone else cast any light on it?
Two back-to-back silicon diodes (Rectifier 205 in GPO parlance) can be connected across the receiver terminals as a clipper to prevent acoustic shock from transient clicks. Such a refinement isn't essential, but was fitted as standard on later instruments (746) with the more sensitive balanced armature receivers. A couple of 1N4001 or whatever will do, if you feel the need.
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Old 19th Jan 2011, 1:16 am   #7
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Default Re: 232L bakelite telephone and No 26 Bellset

I'm only to glad to help Ivan - it's usually me asking the questions

I'll send you a PM (Private Message) on where you can obtain the bits you require.

A rectifier isn't essential but it is desirable. It's a small electronic component usually known as "Rectifier No.205" that fits inside your telephone across the handset's receiver terminals similar to how the resistor has been fitted. It helps prevent acoustic shock which is an uncomfortably loud click in the handset receiver. I think acoustic shock usually occurs when you operate the dial or lift the handset off the cradle. They either have two stiff wires coming out of them which you trap under the relevant screws of the telephone's terminal block or flat strips of metal shaped like spade connectors - this type is stronger and less likely to get bent over.

Someone else may have to step in here as I'm not sure which of the screw terminals the rectifier goes to on a 200 series Telephone.

Regards for now, Lee.
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Old 19th Jan 2011, 1:18 am   #8
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Default Re: 232L bakelite telephone and No 26 Bellset

Sorry, Russell posted you a reply while I was still - slowly - typing mine
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Old 19th Jan 2011, 10:18 am   #9
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Default Re: 232L bakelite telephone and No 26 Bellset

Quote:
Originally Posted by frglee21 View Post
I think acoustic shock usually occurs when you operate the dial...
Using clipping diodes for limiting dialling pulses in the receiver is a bit of a 'sticking-plaster' solution. If you are hearing loud clicks when dialling, then your 'dial-off normal' contacts need cleaning! These contacts are configured to shunt the receiver and/or to quench any sparks produced by the dial contacts, giving rise to induced clicks.

Deal with these issues first before slapping in a couple of diodes.
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Old 20th Jan 2011, 11:53 am   #10
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Default Re: 232L bakelite telephone and No 26 Bellset

Russell
Thanks for the benefit of your experience, and obvious expertise in this area.
I have just ordered a new cord with spade terminals to replace my made up one.
When I take delivery and wire the bellset to the phone I will post everyone to let you know how I faired.

Thanks All
Ivan
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Old 25th Jan 2011, 1:55 pm   #11
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Default Re: 232L bakelite telephone and No 26 Bellset

I have received my rectifier and wondered if anyone knows which terminals it straddles on my 232L pyramid telephone with bellset?
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Old 26th Jan 2011, 1:24 pm   #12
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Default Re: 232L bakelite telephone and No 26 Bellset

Quote:
Originally Posted by ivanidea View Post
I have received my rectifier and wondered if anyone knows which terminals it straddles...
It straddles the terminals connected to the receiver which, if you have the original handset cord, will have red and green coloured ends. Terminals 5 and 8, according to the cct-diagram (see here).
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Old 26th Jan 2011, 7:24 pm   #13
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Default Re: 232L bakelite telephone and No 26 Bellset

russell
I have paired my units as follows.
Bellset:-
I removed all links
connected resistor between term 8-9
connected white of plug cord to term 2
connected blue of plug cord to term 9
red cord unconnected
Plugged this arrangement into wall socket after connecting as follows.

232L telephone to bellset (Connected with 4 core handset cord)
Red T3 to B5
White T1 to B7
Blue T2 to B3
Green unconnected

When plugged in phone has no dialling tone
Rang number with my mobile
Bellset rang, but on lifting receiver line dead and bellset continues ringing.

The handset cord on my 232L is a modern curly cord type.

Would appreciate your guidance.
Ivan

I'm not very good at reading diagrams so I have not done anything with the rectifier
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Old 26th Jan 2011, 9:11 pm   #14
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Default Re: 232L bakelite telephone and No 26 Bellset

Quote:
Originally Posted by ivanidea View Post
russell
I have paired my units as follows.
Bellset:-
I removed all links
connected resistor between term 8-9
Terminal 9 in the bellset isn't used, according to the circuit diagram. In fact, according to my drawing, it isn't shown at all!

Here's what I would do:

FIRST OFF, IN YOUR BELLSET 26:-

1): There should be terminals marked 1, 2, 3, 4, 5, 6, 7, 8. Connect your 3k resistor between terminals 7 and 8. Ignore terminals E, 6 and 9.

2): Remove any link between terminals 4 and 5.

3): Ensure there is a link between terminals 2 and 3.

4): There really ought to be a link between terminals 1 and 7, but this isn't essential. HOWEVER - I'll leave it in, as it makes numbering easier between telephone and bellset, so ensure that terminals 1 and 7 are linked.

5): Connect the white wire of your standard BT plug and lead (pin 2 on the plug, as discussed elsewhere) to the linked terminals 1 and 7 in your bellset.

6): Connect the red wire of your standard BT plug and lead (pin 5 on the plug) to terminal 5 in your bellset.

7): Connect the blue wire of your standard BT plug and lead (pin 4 on the plug) to the linked terminals 2 and 3 in your bellset.

CONNECTING YOUR 232 TELEPHONE TO YOUR BELLSET 26:

8): Connect the linked terminals 1 and 7 in your bellset to terminal 1 in your 232 telephone (thus taking your standard BT plug and lead white wire from the bellset to the telephone).

9): Connect terminal 5 in your bellset to terminal 3 in your 232 telephone (thus taking your standard BT plug and lead red wire from the bellset to the telephone).

10): Connect the linked terminals 2 and 3 in your bellset to terminal 2 in your 232 telephone (thus taking your standard BT plug and lead blue wire from the bellset to the telephone).

This should work, providing you haven't disturbed the handset wiring in the process.
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Old 27th Jan 2011, 5:13 pm   #15
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Default Re: 232L bakelite telephone and No 26 Bellset

Russell
Thanks for your valuable time.
You guessed correctly I might dislodge some of the handcom cord.
The cord is modern curly and coloured Red, Green, and White
The White one is attached to T4 in the telephone.
The Green and Red are detached and I can not see on the diagram what telephone terminals they go on. Can you help
Thanks for your patience.

Ivan
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Old 27th Jan 2011, 6:53 pm   #16
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Default Re: 232L bakelite telephone and No 26 Bellset

Assuming your handset cord is coloured correctly (you can buzz it out with a continuity tester or multimeter if you're unsure) and the wiring is as follows:-

RED = Common mic / receiver.
WHITE = Mic only.
GREEN = Receiver only.

Then the RED wire goes to terminal 5 in your 232 telephone.
The WHITE wire goes to terminal 4 in your 232 telephone, and...
The GREEN wire goes to terminal 8 in your 232 telephone.

Once you have got it working and you wish to fit the rectifier, it goes across terminals 5 and 8, i.e: the terminals to which the receiver is connected.
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Old 30th Jan 2011, 5:05 pm   #17
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Default Re: 232L bakelite telephone and No 26 Bellset

Have made good progress.
The phone now works, but the bellset doesn't.

Going to check my connections on the bellset.
I am going away for a week. Will update everyone on return.
Thanks
Ivan
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Old 30th Jan 2011, 5:45 pm   #18
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Default Re: 232L bakelite telephone and No 26 Bellset

Check your bell-coil resistances as well, i.e: check for 1,000 Ohms-ish d.c. resistance between terminals 2 and 8 of your Bellset 26. Check for continuity between linked terminals 2 and 3 on your bellset 26, and pin 4 of your plug (or pin 3 of the socket into which you plug it in).
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Old 14th Feb 2011, 9:16 pm   #19
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Default Re: 232L bakelite telephone and No 26 Bellset

Just to let everyone know that I am up and running.
thanks to all, in particular Russel who has shared his superior knowledge.
I am over the moon.
I am going to start another project with the old telephones and will be back.
Thanks

Ivan
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Old 15th Feb 2011, 9:19 am   #20
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Default Re: 232L bakelite telephone and No 26 Bellset

Quote:
Originally Posted by ivanidea View Post
thanks to all, in particular Russel who has shared his superior knowledge.
Aw, gee, shucks... Thanks!

All you need do is ask, and this is the place to do it! Collective wisdom of telephonoraks everywhere!

Best of luck with any future projects.
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