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Sets and Parts Wanted (private buyers only, no swaps) If you need help obtaining components, sets or equipment, post a message here. Private buyers only - no traders. No swaps.

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Old 3rd Dec 2023, 3:46 pm   #1
mole42uk
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Default EKCO A274 L14 choke needed!

The 1956 EKCO A274 that I inherited from Dad has died - the HT smoothing choke has gone o/c - it should have a resistance of 220ohms and pass a current of about 80mA. The part number is S.A. 5455.

I'd be delighted if someone has a good one somewhere, or if I could know the impedance so that I could substitute another.

Any help gratefully received.
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Old 3rd Dec 2023, 8:26 pm   #2
Ed_Dinning
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Default Re: EKCO A274 L14 choke needed!

Hi Richard, probably about 5 to 10H max.
Most small chokes should do if the carry the current without getting too hot
At a pinch an old OP trans primary may work

(Unless originality is important)

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Old 3rd Dec 2023, 8:35 pm   #3
stevehertz
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Default Re: EKCO A274 L14 choke needed!

Mouser offer quite a few 10H chokes:

https://www.mouser.co.uk/c/passive-c...uctance=10%20H
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Old 3rd Dec 2023, 11:09 pm   #4
mole42uk
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Default Re: EKCO A274 L14 choke needed!

Thanks Ed, I’ve a few chokes in the scrap heap, I’ll see if anything is suitable. Originality isn’t important, having a working set is - we use it most days….
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Old 4th Dec 2023, 11:26 am   #5
paulsherwin
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Default Re: EKCO A274 L14 choke needed!

It's a pretty generic choke, so anything from a scrap set should be OK. You could also substitute a resistor at the cost of a bit more hum.
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Old 4th Dec 2023, 12:01 pm   #6
Station X
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Default Re: EKCO A274 L14 choke needed!

I have a choke which bears the military code 10C/4593.

Measures 6H 170R on my Peak Atlas LCR45

H 70mm
W 50mm over laminations
D 45mm over windings.
Fixing centres 60mm

Yours for the cost of the postage if it's any good to you.
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Old 4th Dec 2023, 1:14 pm   #7
mole42uk
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Default Re: EKCO A274 L14 choke needed!

Quote:
Originally Posted by paulsherwin View Post
It's a pretty generic choke, so anything from a scrap set should be OK. You could also substitute a resistor at the cost of a bit more hum.
I'll be going the resistor route before replacing the choke, just to check that there's nothing drawing excessive current. But I don't want more hum - this set's a little hummy already.....
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Old 4th Dec 2023, 11:16 pm   #8
dave_n_t
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Default Re: EKCO A274 L14 choke needed!

Richard,
I think I have the exact same choke removed from a scrapper A274 some years ago (!).
I'll get back to you tomorrow, after I've done some digging around.


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Old 10th Dec 2023, 12:20 pm   #9
mole42uk
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Default Re: EKCO A274 L14 choke needed!

Fabulous news is that the choke from Dave is installed and the set is now back in action!

Mods please close the thread.
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