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Swinging choke or not?
Swinging choke or not?
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Old 21st August 2019, 02:42 PM   #1
Demonkleaner is offline Demonkleaner  United States
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Red face Swinging choke or not?

I just dissembled a very large hernia inducing amateur radio power supply. It used 4 872A rectifiers and a couple very ugly filament transformers. I found that it had two 9H chokes in it. The number K34J253 is printed on the top of each one with 500MA written in pencil. 9H is what I measured with my little handheld meter. Is there a way to determine if the chokes are normal or swinging? I did a bing search and the swinging choke photos were blurred out.
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Old 21st August 2019, 03:53 PM   #2
DF96 is offline DF96  England
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A swinging choke is one which loses some inductance with more DC, yet can handle the DC from a heat point of view. You test for it by measuring inductance with DC present. For a given inductance and current rating, a swinging choke is lkely to be smaller (and lighter in weight) than an ordinary choke yet use the same size wire.
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Old 21st August 2019, 04:00 PM   #3
tubesguy is offline tubesguy  United States
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Probably not a swinger. They tended to have a range of inductance and a corresponding range of current flow printed on the case. Yours has one current and one inductance specified.

I did a Google search and found this, however:

https://www.americanradiohistory.com...-1948-05-R.pdf

It show a project that uses a GE choke with your part number, albeit identified as 10H, 250ma.

The magazine is from 1948, and chock full of the kind of gear and projects that would have driven me insane as a lad. I really want a Hallicrafters T-54 television. 23" screen! (That's measured in square inches.)
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Old 21st August 2019, 04:45 PM   #4
Demonkleaner is offline Demonkleaner  United States
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Thanks DF96 and Tubesguy.

I looked at that article and I believe the GE part is probably what I have.

They're enclosed in square cans and I thought them capacitors until I removed them and felt the weight. A lot heavier than a capacitor.

How did you manage to find that article?

Interesting stuff. The old ads are cool.

I think I have all the QST's from the early thirties through the sixties.

Tons of great stuff in them.

I have some Hallicrafters stuff but no televisions.

Folks are restoring the old TV's now.
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Old 21st August 2019, 05:22 PM   #5
tubesguy is offline tubesguy  United States
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Oops, misread your initial post and thought the choke was marked.

I found the article just by googling "K34J253 choke"
I'm amazed frequently by how deep a dive these search engines take.

Got a Hallicrafters SW radio one year for Christmas. Best Christmas ever.
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Old 22nd August 2019, 04:33 AM   #6
PRR is offline PRR  United States
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Quote:
Originally Posted by tubesguy View Post
...I really want a Hallicrafters T-54 television. 23" screen! (That's measured in square inches.)
And 13 channels! (We still had channel 1. See chart on page 180.)

Page 175 offers JAN EIMAC 304TL for $0.90 each. (Now sells near $300.)
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