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Old 20th July 2003, 06:23 AM   #1
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Default SIE chokes -- how much current

Scored some NOS chokes today (in their boxes with the wax paper wrapping in tact). Each has 2 x 25 henry chokes (and instructions for series or parallel). Any guesses to how much current could be run thru them?

How do you actually measure current capability?

Southwestern Industrial Electronics Co, Huston TX. Model KC5005

dave
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Old 20th July 2003, 08:41 AM   #2
dhaen is offline dhaen  Europe
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Default A brace of choke!

Guestimate

200mA (sections in series)

As for testing, can only think of a contrived way to test (an actual circuit).
Someone must know an easier way....

You might also want to know whether they are suitable for choke-input use as well; eg whether they can stand some DC without loosing too much inductance and buzzing.

What is their DC resistance?

Time for a nice valve amp I think Dave....


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Old 20th July 2003, 11:23 AM   #3
eduard is offline eduard  Netherlands
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Hello Take care i once destroyed some black Gate with a choke input with a surplus choke. If you will not use it for a choke input you can try to give it a try with a modest current and check the temperature from time to time. Maybe they are meant for aviation industry ( 800 cycles ) I would anymore go to a person with enough equipment to have them tested Succes, Ed
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Old 20th July 2003, 04:26 PM   #4
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Default Re: A brace of choke!

Quote:
Originally posted by dhaen
You might also want to know whether they are suitable for choke-input use as well; eg whether they can stand some DC without loosing too much inductance and buzzing.
I would like to use them in a PS, and i did get a pair so monoblocs are a possibility

Quote:
What is their DC resistance?
the indings are 8.8 and 8.9 ohms

Quote:
Time for a nice valve amp I think Dave....
Yes... i have lots of candidtaes, the big missing ingredient is time.

dave
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Old 21st July 2003, 03:32 AM   #5
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Default Re: Re: A brace of choke!

Quote:
Originally posted by planet10



the indings are 8.8 and 8.9 ohms


dave

man that a low DCR... given the size are you sure you didn;t miss a decimal on the 25hy... .25hy seems much more believable.

just for reference a 20hy 150ma choke about that size has a DCR of 300 ohms.... and remember the two 25 hy chokes in series is 100hy!!! a 100hy choke with an 18 ohm DCR seems very unlikely.

if they are indeed 2X25hy, i wouldn't expect them to handle much DC... or AC for that matter.

dave


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Old 21st July 2003, 05:21 AM   #6
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Default Re: Re: Re: A brace of choke!

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Originally posted by dave slagle
man that a low DCR... given the size are you sure you didn;t miss a decimal on the 25hy... .25hy seems much more believable.
The other one measures the same DCR wise.

I put 1st one on my inductance bridge and as close as i can figure each half is 10 Hy, but i was getting some weird results -- when i get a chance i'll take em both down and remeasure.

dave
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Old 21st July 2003, 06:24 AM   #7
SHiFTY is offline SHiFTY  New Zealand
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judging by the guage of that wire I would say much more than 200mA....

And yeah 8ohm is pretty low, I had a 1H choke that measured 20 ohm!
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Old 21st July 2003, 08:57 AM   #8
EC8010 is offline EC8010  United Kingdom
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9R is a very low DC resistance for a stated 25H inductance. The only way I can see of achieving two of those in a can that size is not to gap the core, making the DC current rating zero. I suspect that these chokes were made to be part of a signal filter, not a power supply - they have a telecomms look about them, particularly with the paint masked from the mounting surface.
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Old 21st July 2003, 03:56 PM   #9
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Quote:
Originally posted by EC8010
I suspect that these chokes were made to be part of a signal filter
As this thread developed, i wondered if that would turn out to be the case... do they have any use in an amp?

dave
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Old 21st July 2003, 04:43 PM   #10
EC8010 is offline EC8010  United Kingdom
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Some people have used chokes in place of grid-leak resistors. Mind you, yours are a bit large (physically). You'd need to check their stray capacitance though. I rather suspect that you may have scored a pair of doorstops or bookends...
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