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Vintage Telephony and Telecomms Vintage Telephones, Telephony and Telecomms Equipment |
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24th Feb 2018, 11:34 am | #21 |
Retired Dormant Member
Join Date: Dec 2007
Location: Shropshire, UK.
Posts: 3,051
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Re: Phones or intercoms?
Well, I've learnt something!
I always thought it was pronounced 'Gekkophone'. |
24th Feb 2018, 4:29 pm | #22 |
Dekatron
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,118
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Re: Phones or intercoms?
Salvador DalĂ clearly missed a trick there. He should have had a "Geckophone" instead of (or to go with) his Lobster Telephone.
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3rd Jul 2018, 5:28 pm | #23 |
Heptode
Join Date: Aug 2004
Location: Woodbridge, Suffolk, UK.
Posts: 501
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Re: Phones or intercoms?
I know I posted ages ago, but have been somewhat unwell. So have just pulled these out again. Could someone just explain the wiring, battery ect. Thanks
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3rd Jul 2018, 10:28 pm | #24 |
Tetrode
Join Date: May 2013
Location: Enniscorthy, County Wexford, Ireland.
Posts: 74
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Re: Phones or intercoms?
My vote is for a intercom system, possibly a battery box and or induction coil is fitted between the sets. If not then lots of acoustic shocks. Normally in old stuff the battery terminals would be marked c for carbon or plus and z for zinc or negative. The likely battery voltage is probably about 3V. The on hook key and the ringing key are also slightly confusing. The ringing is probably DC. If you draw the corresponding set it should become less murky.
Regards EI7KA. |
3rd Jul 2018, 11:26 pm | #25 | |
Heptode
Join Date: Jan 2008
Location: Hakadal, Norway
Posts: 640
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Re: Phones or intercoms?
Quote:
on each telephone you may have 2 batteries, Between BT and BL you have a battery used for voice and ringing. Normal D-sells are plenty, alkaline AA will probably do. Depending on the resistance in the line, the voltage should be adjusted to send 25-50 Milli-ampere when both phones are off hook. (More than 50 Milli-ampere may fry your transmitter capsule) (Usually 2 cells on each phone will be OK) The battery between P and BT will be same size, and voltage needed to ring the bell on the other phone. (on short lines even no battery, just a strap may do) You have to test. As you see the line are switched, L on one to BL on the other. If those wires not are like that, the batteries on on of the phones has to change polarity. dsk Last edited by dagskarlsen; 3rd Jul 2018 at 11:36 pm. |
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3rd Jul 2018, 11:46 pm | #26 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,528
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Re: Phones or intercoms?
That centre tapped dual battery arrangement is devious. Both receivers and transmitters all in series with two batteries is somewhat crude, though.
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17th Jul 2018, 3:25 pm | #27 |
Heptode
Join Date: Aug 2004
Location: Woodbridge, Suffolk, UK.
Posts: 501
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Re: Phones or intercoms?
Thanks all for the comments, dagskarlsen I followed your diagram, all working thanks.
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23rd Jul 2018, 9:54 pm | #28 | ||
Heptode
Join Date: Jan 2008
Location: Hakadal, Norway
Posts: 640
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Re: Phones or intercoms?
Quote:
Quote:
dsk |
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