Trimphone. Broken regulator No.7

[maxmixed]

Hi Guys,
last night I was changing the line cord on a Trimphone I recently bought, and somehow I managed to break the connector off of the Regulator No 7 (The large blue cylinder, which prevents I believe line noise)
Does anyone know where I can get a replacement?? (I scoured ebay the internet to no avail last night)

Or
Is there something that I can purchase (Maplins??) that I can use to replace the regulator?

Or
Is this something I will have to try to repair myself (bear in mind I have zero soldering skills) and is this something I could do myself

Any help, as ever, greatly appreciated

[Nickthedentist]

This site suggests it was a mod for use on short lines, so unless you're very close to the exchange, you should be OK without it, I'd guess.

http://www.samhallas.co.uk/collectio..._trimphone.htm

Nick

[AndiiT]

Max, you have a PM

[maxmixed]

Thanks Guys,

PM back AndiiT

[dagskarlsen]

The regulator could be replaced by something as simple as a resistor, The regulator was some kind of self adjusting shunt limiting the current trough the carbon transmitter. I would try with a simple 220 ohms 1/2 watts resistor. If the signal level from the transmitter drops too much, try 330 ohms.
dsk

[maxmixed]

Hi Guys,
Just finished working on my latest GPO 772 Trimphone, plugged it in, and nothing, it's dead as a dodo!!

It's wired thus -

Dial

Orange T8
Blue T2
Brown T3
Grey T1
Pink T10

Line

Red T1
White T8
Green T2
Blue T3

Handset

White T19
Green T15
Red T8
Blue T6

Straps

5-6-7
16-17-18-19 (These straps were as it came, which I assume was when it worked)

I know I'm missing the regulator (the Blue One, No.7?) But would this stop the phone working, without the regulator?

Any ideas? Have I mixed the wiring up??
I'm so frustrated, so much so that I can't tell you how much!!

[Station X]

If you want your phone to work without a regulator, you'll need to link together certain points.

This link points to the circuit for a Tele 706, but the points to be linked ie B, C and D are the same:-

http://www.samhallas.co.uk/repositor.../0000/N806.pdf

If your phone is on a short line, you may find it rather loud owing to the missing/bypassed regulator.

[dagskarlsen]

I have probably misunderstood where the fault are. Graham knows British telephones much better than I do. My last post in this thread was referring to a unit with only 2 contact points. This unit was put as a shunt of the transmitter in hence to reduce noise. The regulator in the link are a more complex circuit.

dsk

[julie_m]

The thing DSK is referring to is just a simple device which can be replaced with a pair of back-to-back silicon diodes such as 1N4007.

[Station X]

Indeed. The GPO designation was Rectifier Element No. 205.

It was fitted across the receiver (not the transmitter as stated) and served to suppress loud clicks.

[AndiiT]

Originally Posted by maxmixed

.....Have I mixed the wiring up??

In a nutshell yes! you appeared to have muddled up the handset wiring with the line cord wiring.

Wire the handset cord as follows -

White - T10
Red - T1
Green - T2
Blue - T3

Strap T4 - T5 - T6 - T7
Strap T16 - T17 - T18 - T19

Wire your line cord as follows (presuming it is a four wire cord with standard colouring, if not let us know)

White - T18
Red - T8, ensuring that the orange lead from the dial is also connected to this point
Blue - T5
Green (which is spare and not used) - T15

Try that and let us know if you experiencing any ringing problems on an incoming call and we'll advise further

Andrew

[Station X]

Sorry, but I confused Regulator with Regulator No.7.

What DSK says in post #5 is correct.

Ignore my post #7.

[maxmixed]

Hi Guys, Well it works now. Although the only problem is speech & sound are both very very very faint, almost to the point of being inaudible.

Could I have wired the microphone/receiver in the handset up incorrectly?? Or if I had done this would it just not work at all??

[AndiiT]

Hi, the inaudible speech will probably be due to the transmitter inserts carbon granules having dried up over time. The only option is replacement but most inserts will be well past their useful capacity these days. If so minded you may be able to modify the handset to take the insides of a transmitter no.21 but this isn't an easy task.

Ensure that the handset blue and white wires go to the transmitter and terminals T3/T10 in the telephone, and the red and green wires to the receiver and terminals T1/T2.


Regards

Andrew

[dagskarlsen]

It "sounds" strange.
This are a relatively new phone. I guess it should be possible to figure out whats wrong.
The wiring diagram: http://tinyurl.com/18r
are quite complex, but to go over the connections and look after if it is as in the diagram should be a minor job. Maybe even go back to the original ringer wiring, and later modify to UK outlet standard (if needed)

dsk

PS Transmitter element, and receiver element in series direct to the line should indicate if these two elements are OK
DS