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Vintage Telephony and Telecomms Vintage Telephones, Telephony and Telecomms Equipment |
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27th May 2019, 10:33 pm | #41 | |
Heptode
Join Date: Jul 2007
Location: Flintshire, UK.
Posts: 707
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Re: "Butt" 'phone
Quote:
The Engineering Instruction for the Tele 704 states 2. PREVENTION OF INTERFERENCE TO WORKING CIRCUITS When connecting the telephone to a pair in a cable that contains working circuits, prevent possible disturbance to a working circuit as follows:- 1.Set the three-position slider switch to the CB position and connect the telephone to line. 2.Press the transmitter CUT-OFF button on the handset before removing the handset from its cradle. 3.Check that the line is not in use. 3. AUTOMATIC EXCHANGE LINES 1.Check, as described in par 2, that the line is not in use. 2.If the line is not in use, release the transmitter CUT-OFF button. 3.Dial the required number. The Tele 704 was superseded in 1973 by the 'PO Tele 704B' marked on the top and that has had an 82 ohm resistor fitted such that it kept the loop even when the microphone was disconnected. I assume that the same applies to the 'BT Tele 704C' which followed it - but that's too late for my van ! Last edited by Pellseinydd; 27th May 2019 at 10:53 pm. |
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28th May 2019, 9:54 am | #42 |
Dekatron
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,127
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Re: "Butt" 'phone
I can confirm the monitor function to be available, using my telephone tester, with one of the three 704s that I have.
The one specifically labelled as a 704B, as expected, continues to make a loop with the cut-off button pressed. The second, with no model number label, but with a sticker saying BBC, only makes a loop when the cut-off button is released. The final (unlabelled) one doesn't have a cut-off button. By the way, it would be a BAD idea to connect to a CB/auto exchange in LB mode, as one would be attempting to put power from the battery onto an already-powered line!
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Mending is better than Ending (cf Brave New World by Aldous Huxley) Last edited by Dave Moll; 28th May 2019 at 9:58 am. Reason: By the way... |
28th May 2019, 10:27 am | #43 | |
Heptode
Join Date: Jul 2007
Location: Flintshire, UK.
Posts: 707
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Re: "Butt" 'phone
Quote:
Incidentally the Tele 250 always feeds battery out to line even on 'auto' ! There seem to be quite a few non-GPO/PO/BT variants of the Tele 704 style including ones without provision for the dial. I had one that I sold a couple of years ago and there is one on eBay at the moment |
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28th May 2019, 11:42 am | #44 |
Dekatron
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,127
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Re: "Butt" 'phone
Yes, I discovered that when I acquired mine. This seems a rather dubious way of operating.
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Mending is better than Ending (cf Brave New World by Aldous Huxley) |
28th May 2019, 2:09 pm | #45 |
Hexode
Join Date: May 2009
Location: Newcastle, Australia
Posts: 319
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Re: "Butt" 'phone
Hello all.
I keep wondering how a poor lonely little Aussie butt phone found itself in a car boot sale in the "Old Dart"? Consider that these bits of kit were never sold to the general public. They were manufactured in the government PMG workshop in Melbourne and intended for the use of PMG employees only. In fact many years ago anyone found in possession of one of these was going to be asked some very serious questions by the constabulary as to just how it was acquired. For many years in Australia the PMG's Department held a very tight rein on anything to do with the PSTN. All but a very few subs phones were rented from the department. There were no contractors other than equipment manufacturers own technicians doing exchange equipment installation. Members of the public were not allowed to touch any phone wiring even in their own homes. This holds true today however most of the work is done by licensed contractors. I guess Dave that your phone somewhere along has been discarded or nicked way back in the mists of history. Quite often this sort of stuff has been accumulated by an employee of said organization and for some reason has not been handed back on retirement or whatever. It is so old that nobody cares any more. I have met storemen that have thanked me for taking something as it saves them from the paperwork and having to throw it in the bin. The PMG's Dept. was a federal govt. body and covered the whole of Australia but there was another govt. department that had it's own telephone system that the PMG had no say in. The New South Wales Govt. Railways. They had their own comprehensive phone system. and their own methods on Railway land. It is nice for me to know that I am not alone in collecting butt phones. I found dagskarlsen's pictures fascinating. Especially the one with the two dials. Anyway, enough of my chatter for now. Cheers all, Robert. |
28th May 2019, 3:14 pm | #46 | |
Dekatron
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,127
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Re: "Butt" 'phone
Quote:
I assume it entered the collectors' market in a similar manner to the ones displayed earlier in this thread, but somehow accompanied its then owner on a trip from Oz to Blighty.
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Mending is better than Ending (cf Brave New World by Aldous Huxley) |
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9th Sep 2019, 10:39 am | #47 |
Nonode
Join Date: Oct 2010
Location: Gloucester, Glos. UK.
Posts: 2,150
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Re: "Butt" 'phone
BT Branded butt phone I picked up at the weekend for a couple of quid or so.
Not a pretty one though. |
9th Sep 2019, 12:49 pm | #48 |
Dekatron
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,127
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Re: "Butt" 'phone
One of the extra features I like about the 290 (as above) is the LEDs below the keypad that show the polarity of the line - green on the right for correct and red on the left for reversed.
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