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Vintage Telephony and Telecomms Vintage Telephones, Telephony and Telecomms Equipment |
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21st Mar 2018, 12:19 pm | #1 |
Pentode
Join Date: Mar 2012
Location: Rotherham, South Yorkshire, UK.
Posts: 152
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4T receiver
Just looking into getting a new 4T receiver, seen on Telephone Lines he does a modern replacement - but the connections are different. Will this mean replacing the spade terminals on the wires in the handset with a female connector?
Thanks! |
21st Mar 2018, 12:39 pm | #2 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,953
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Re: 4T receiver
The one in thta link looks to have 'mini blade' connectors so yes you'll need to replace the spades you already have.
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21st Mar 2018, 12:44 pm | #3 |
Dekatron
Join Date: Jan 2005
Location: Oxford, UK.
Posts: 17,820
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Re: 4T receiver
I suspect those were out of a Statesman or similar.
If you're adept with an iron (and lucky!), you might be able to tack the right style of push-on connector onto the existing tags, then cover everything with heatshrink. The tinsel wire in curly handset cords are nightmare to re-terminate so I'd try to preserve the spade terminals rather than chop them off. Alternatively, have you tried requesting a normal 4T here? There are loads about, I'm sure. Nick. |
21st Mar 2018, 7:39 pm | #4 |
Heptode
Join Date: Oct 2006
Location: Leeds, West Yorkshire, UK.
Posts: 593
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Re: 4T receiver
Unless I'm mistaken, these 'other' 4T inserts look to have an impedance of 600 ohms. I don't know if that is significant technically.
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21st Mar 2018, 7:57 pm | #5 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,953
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Re: 4T receiver
"Mini blade" push-on connectors are available easily: your local Halfords will have them. In your situation I'd get a set of mini-blades, then cut the actual spade-part off your eisting tags, leaving the crimp-part of the old spades still attached to the cable [so preserving the existing contact with the 'tinsel']
This is essentially using the crimped part of the old spades as a 'bootlace ferrule' to fit into the mini-blade connectors where the cable would usually go. Then push the crimped-part of the old spade-tags-on-the-ends-of-the-wires into the mini-blade, and crimp. Job done! |
21st Mar 2018, 8:56 pm | #6 |
Dekatron
Join Date: Jan 2005
Location: Oxford, UK.
Posts: 17,820
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Re: 4T receiver
I like that idea, G6T.
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21st Mar 2018, 10:22 pm | #7 | |
Dekatron
Join Date: Jul 2007
Location: Penrith, Cumbria, UK.
Posts: 3,684
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Re: 4T receiver
Quote:
* Old receiver: 61.6 Ohms Z @ 1kHz. * New receiver: 462 Ohms Z @ 1kHz. The sound of the newer receiver is faint compared to the original in a 746 instrument, where the impedances of the sidetone network are optimised for the original 4T impedance, but is still audible.
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Regds, Russell W. B. G4YLI. |
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