Help with Gecophone 67 (actually a 47)
I have a gecophone 67 that makes a loud clicking noise when the dial is turned and when the receiver is replaced. It also needs a new handset cord. I only know how to rewire and replace the handset cords on gpo 300 series phones. Would be most grateful for any advice.
Sorry should be Gecophone 47, the desk type that looks similar to a gpo pyramid but with internal bells. Angela::wave: |
Re: Help with Gecophone
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Use a drop of isopropanol or pull a 'spec-wipe' through between them. Is handset not just a 164-type three wire handset same as on a 300 instrument but with GEC stamped on it? Cord replacement is similar (says he without looking at his Gecophone) with a whipped loop attached to the metal plate at the mic end where the pin contact is screwed into. |
Re: Help with Gecophone 67
Hi Russel, many thanks for your most welcomed advice.
I used a piece of very fine sandpaper inbetween the dial contacts as I had no blotting paper. I also lightly oiled with clock oil and a cotton bud. Is isoproponal the same as rubbing alcohol? I do have rubbing alcohol, would that do? The phone does ring when I get incoming calls; does that mean the line cable is ok? It does need the handset cord replacing though. I just need to know how to replace it. Would I still need to use a rectifier and resistor Like I would in a GPO 300 type? I would be most grateful if you could post some instructions. Many thanks and kind regards Angela PS. I forgot to mention that the handset does have GEC written on it in the recess bit of the handset |
Re: Help with Gecophone 67
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Generically, you need the rectifier across the receiver terminals - it will clip off excessive loudness, and you may or may not need a 3k3 resistor in series with the bell movement; it all depends on whether you intend using other instruments on the line at the same time. The handset lead is simply a case of wire-for-wire replacement, and unpicking the whipped cotton loop at each end. Do you have a replacement handset lead to go on? Has it got cotton loops on it? There's a chap over on the Telecommunications Heritage Group who manufactures cotton-covered replacement leads and cabling for old telephones, but they are available from other sources. What does the end of the cable you are going to fit look like, if you have it? -- |
Re: Help with Gecophone 67
Hi Russell, many thanks for your prompt reply. I hope the dial doesn't suffer any damage in the long term because of me stupidly using a fine sandpaper; just goes to show what a complete novice I am. I don't feel competent enough to risk removing the dial. I have now used a thin wooden spatula, wrapped kitchen roll round it and dipped it in rubbing alcohol which is isopropyl and rubbed back and forth between the connectors; Left to dry then did the same again using a few drops of clock oil. The dial is turning smoothly forward and back as it should. In fact better than it was before as it was just a tad slow. Thank you for the link to the gecophone diagrams. My model was there with instructions and diagram. There is a line cord in situ but wasn't wired correctly; I've now resolved that and replaced the handset cord. The instructions said to fit a 205 rectifier between T 5&6 green & red of handset cord, and a 3.3 resistor between L1 & E of bellset. I have also replaced the old mic with a 21a and the P1 with a P2 and 25 diapragm. The phone is now fully functional with clear incoming and outgoing speech. I just hope that the dial will be ok in the long term.
I can't thank you enough for your very helpful advice. Best wishes and kindest regards Angela:thumbsup: |
Re: Help with Gecophone 67
Hi Angela,
A good job done by the sound of it! :) Your dial should be OK but keep an eye on it and if starts running slow, just clean it again. I'd get hold of an old dial, if you can, just to play with. Thay're not that tricky really unless you do a complete strip down, when they can induce minor swearing. I retrieved my Gecophone from the shed for a look in case you needed a 'talk-through'. Mine is about 1943 vintage with the blunter handset rest than the 'stags answers on the earlier models and is the simple one-capacitor version with the small induction coil. But I'm aware of its provenance and it wtill works fine with orig, carbon mic. I have a resistor in mine but no rectifier. Pleased you got sorted, anyway. They're an nice instrument. :) |
Re: Help with Gecophone 67
Meant to say... There's no need to oil the dial contacts. Oil is an insulator and whilst it's good practice to apply the thinnest smear of Vaseline (Petroleum Jelly) to electrical power contacts, it's not a good idea on telephone equipment contacts, as sticky lubricant will attract dust and gunge over time, even in the cleanest environment, and will build up a high-resistance barrier.
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Re: Help with Gecophone 67
I have to speak with my mouth right up to the mouthiece
On my gec gecophone to be heard by the person on the other end. What could be the problem? Would be very grateful for advice. Many thanks Angela |
Re: Help with Gecophone 67
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Ethanol 90% Methanol 5% Methyl Salicylate Diethyl Phthalate Castor Oil ... so I'm a little unsure how welcome a telephone dial would find these other ingredients, particularly the castor oil. Dylon stain remover, on the other hand, claims to contain propan-2-ol (the IUPAC name for isopropyl alcohol). |
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