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 Wanted Choke
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 Return to top of page · Post #: 1 · Written at 12:58:10 PM on 16 August 2015.
Clive Durham's Gravatar
 Location: Grenfell, NSW
 Member since 8 July 2015
 Member #: 1771
 Postcount: 212

Hi everyone I am in need of the following choke.

It is for an ASTOR GQR radiogram circa 1953

Choke 14H 60Ma 520 ohms DC resistance, I have a feeling that other Astors used this choke as well.

The previous owners took it upon themselves to prod around with a sharp object and cut into the windings, they also powered it up and blew caps and burned wires. The rectifier is shot but the O/p and mains transformer seem to have survived.
If someone has a chassis they wish to get rid of I would be interested in that as well.

Thanks for looking

Clive


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Clive

 
 Return to top of page · Post #: 2 · Written at 7:03:22 AM on 18 August 2015.
Scraps's avatar
 Location: Blue Mountains, NSW
 Member since 10 March 2013
 Member #: 1312
 Postcount: 401

If you don't have any luck finding one I can highly recommend David Browne in Victoria who does rewinds for a very reasonable price. His website is http://www.transformerrewind.com.au/ and there is a link in the Services Directory on this forum as well.


 
 Return to top of page · Post #: 3 · Written at 5:35:29 PM on 18 August 2015.
Clive Durham's Gravatar
 Location: Grenfell, NSW
 Member since 8 July 2015
 Member #: 1771
 Postcount: 212

Hi Scraps, Thank you for that information, very handy.

Being my usual inquisitive self I pulled the choke apart and started to unwind the bobbin (counting turns as I went) until I came to the break, There were several breaks on different levels still and I picked them out a little and used the meter to see if I could find contact with the good end. Voila, connection and resistance of 470 ohms, so I have lost about 10%.
I don't suppose it will make that much difference to the voltage dropped across it, normally 40V so I would expect about 36V. The frequency of the PI filter would change a little but I hope not enough to let ripple hum through.
Proof will be when I have replaced all the electros and replaced all the wiring which the insulation has broken off, quite a mess.
Thanks once again for the info

Clive


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Clive

 
 Return to top of page · Post #: 4 · Written at 12:17:07 AM on 10 September 2015.
Art's Gravatar
 Art
 Location: Somewhere, USA
 Member since 22 October 2013
 Member #: 1437
 Postcount: 895

You could still measure the length of what you unwound and wind some new wire back on it
after making a join, but I doubt it will be an issue.


 
 Return to top of page · Post #: 5 · Written at 6:52:10 AM on 10 September 2015.
Clive Durham's Gravatar
 Location: Grenfell, NSW
 Member since 8 July 2015
 Member #: 1771
 Postcount: 212

Thanks Art, all seems to be working now after I sorted a couple of other problems


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Clive

 
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