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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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10th May 2019, 9:33 am | #1 |
Pentode
Join Date: Jun 2013
Location: Worthing, West Sussex, UK.
Posts: 223
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1134A intercom amplifier
Restoring one of these for a friend, have found T2 secondary windings O/C. Has anyone with similar problem fitted an alternative transformer in this position.
I do not fancy rewinding it! Cheers Andy G3UEQ |
10th May 2019, 9:55 am | #2 |
Triode
Join Date: Nov 2007
Location: Brisbane, Australia
Posts: 32
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Re: 1134A intercom amplifier
Hi Andy
I had the same problem with mine, one half of the secondary was o/c Initially I replaced with a 3:1 interstage transformer from Antique Electronic Supply. That worked fine. I also rewound the entire transformer primary & secondary as I destroyed the primary some how in getting the secondary windings off. Rewinding was a real pain, I made up a winder in meccano that automatically went backwards and forwards to lay out the windings. Took hours, but again the end result worked fine and is indistinguishable now from original. You can see my winder here: https://www.youtube.com/watch?v=KWIVDToPSIE At that point it was doing one half of the secondary winding, (the primary had been done) the bits of white are dowels holding the space of the second half of the secondary. regards Peter |
10th May 2019, 10:11 am | #3 |
Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,935
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Re: 1134A intercom amplifier
Andy,Ed Dinning on our group can rewind.
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G8JET BVWS Archivist and Member V.M.A.R.S |
10th May 2019, 10:49 am | #4 | |
Pentode
Join Date: Jun 2013
Location: Worthing, West Sussex, UK.
Posts: 223
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Re: 1134A intercom amplifier
Hamish
Had thought of that, I think he is a bit busy at present but will contact him Cheers Andy Quote:
Love the winder, brilliant, wish I had kept all my Meccano as a kid! OK on replacement transformer, will look into that. Peter, was the transformer from Antique their P-T156 3:1 interstage? Cheers Andy |
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10th May 2019, 11:21 am | #5 |
Heptode
Join Date: Jan 2003
Location: Tewkesbury, Gloucestershire, UK.
Posts: 693
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Re: 1134A intercom amplifier
I had a similar problem, mine having an o/c T1 secondary. They're quite easy to dismantle. I rewound mine with a hand drill (but I have to admit the Meccano winder made by Peter looks like a far better proposition - absolutely wonderful). http://www.tibblestone.com/oldradios...adio/T1154.htm
Interestingly, the original winding had spliced breaks in it. I guess materials were in short supply at the time!
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Keith Yates - G3XGW VMARS & BVWS member http://www.tibblestone.com/oldradios/Old_Radios.htm |
12th May 2019, 2:30 am | #6 |
Triode
Join Date: Nov 2007
Location: Brisbane, Australia
Posts: 32
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Re: 1134A intercom amplifier
Andy
Yes that was the one from AES, fits in easily and works fine Peter |
12th May 2019, 7:57 pm | #7 |
Pentode
Join Date: Jun 2013
Location: Worthing, West Sussex, UK.
Posts: 223
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Re: 1134A intercom amplifier
Thanks Peter
Appreciated. Andy |
16th May 2019, 6:32 pm | #8 |
Pentode
Join Date: Jun 2013
Location: Worthing, West Sussex, UK.
Posts: 223
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Re: 1134A intercom amplifier
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1st Jun 2019, 4:38 pm | #9 |
Pentode
Join Date: Jun 2013
Location: Worthing, West Sussex, UK.
Posts: 223
|
Re: 1134A intercom amplifier
Replacement T2 Antique Electronic Supply, fitted and works well. Using an old static noise cancellng microphone, getting about 4-8v p-p drive for T1154.
Andy G3UEQ |