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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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Old 10th May 2019, 9:33 am   #1
ribbonmicsrus
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Default 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
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Old 10th May 2019, 9:55 am   #2
pnh0001
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Default 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
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Old 10th May 2019, 10:11 am   #3
HamishBoxer
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Default Re: 1134A intercom amplifier

Andy,Ed Dinning on our group can rewind.
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Old 10th May 2019, 10:49 am   #4
ribbonmicsrus
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Default 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:
Originally Posted by pnh0001 View Post
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
Peter
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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Old 10th May 2019, 11:21 am   #5
Keith
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Default 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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Old 12th May 2019, 2:30 am   #6
pnh0001
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Default Re: 1134A intercom amplifier

Andy

Yes that was the one from AES, fits in easily and works fine

Peter
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Old 12th May 2019, 7:57 pm   #7
ribbonmicsrus
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Default Re: 1134A intercom amplifier

Thanks Peter
Appreciated.
Andy
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Old 16th May 2019, 6:32 pm   #8
ribbonmicsrus
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Default Re: 1134A intercom amplifier

Quote:
Originally Posted by pnh0001 View Post
Andy

Yes that was the one from AES, fits in easily and works fine

Peter
Peter
One has been ordered !

Andy
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Old 1st Jun 2019, 4:38 pm   #9
ribbonmicsrus
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Default 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
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