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 Post subject: SX-25
PostPosted: Sep Tue 07, 2021 5:35 am 
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Joined: Jan Tue 19, 2021 1:04 am
Posts: 9
I had a melt down on my filter choke for a sx-25. Anybody have any info on this choke, nothing in manual and I looked on Riders nothing there, i thought about using same choke thats in an sx 23 or sx-24 no information on those two either. Does anybody know the specs. on this choke.
Thanks DannyG


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 Post subject: Re: SX-25
PostPosted: Sep Tue 07, 2021 5:07 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3791
Location: Seattle WA US
The SX-28 choke was 13 Henries at 100ma dc, dc resistance 300 ohms. Halli part number 56B008

Prior to mid-SX-28 production, when they changed to a military format for the Sx-28 manuals, Hallicrafters rarely provided any parts information except R and C values for their radios.

good luck,
Chuck K7MCG


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 Post subject: Re: SX-25
PostPosted: Sep Tue 07, 2021 7:04 pm 
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Joined: Jan Tue 19, 2021 1:04 am
Posts: 9
Thanks Chuck I found a choke on Mouser, its a Hammond 159m --15hy 100ma and 256 ohms i am going to get that one soon as i get alittle more money. It cost 35 dollars, and with taxes and shipping it will be over $50 i expect. This radio is turning from a sx-25 dollars to a sx-300 dollars.
Thanks again for your help--glad u guys are out there
DannyG


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 Post subject: Re: SX-25
PostPosted: Sep Tue 07, 2021 7:13 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1624
Location: Canyon Lake, TX
Be sure to find and correct the fault that caused the original choke to "melt down." Chokes seldom fail on their own . . . some other part failure is usually the cause. Filter capacitors would be the primary suspects.

--Ed

_________________
What happens under the chassis stays under the chassis.


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 Post subject: Re: SX-25
PostPosted: Sep Tue 07, 2021 9:59 pm 
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Joined: Jan Tue 19, 2021 1:04 am
Posts: 9
Yea Ed it was my fault. I brought the radio up on a variac and noticed the voltages were way to high, an instead of shutting it off, i hemhawed around an then the choke melted ----another lesson learned--
thanks DannyG


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 Post subject: Re: SX-25
PostPosted: Sep Thu 09, 2021 4:51 am 
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Joined: Apr Sun 08, 2007 6:47 am
Posts: 5203
Location: British Columbia
DannyG wrote:
Thanks Chuck I found a choke on Mouser, its a Hammond 159m --15hy 100ma and 256 ohms i am going to get that one soon as i get alittle more money. It cost 35 dollars, and with taxes and shipping it will be over $50 i expect. This radio is turning from a sx-25 dollars to a sx-300 dollars.
Thanks again for your help--glad u guys are out there
DannyG


Post an ad in the classified forum, a used one may be available. Sometime you see NOS chokes for sale on fleabay, though someone on here may have one as well. Another possibility is to contact Edcore transformers, but I think a used or NOS one will do.
Regards
Arran


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 Post subject: Re: SX-25
PostPosted: Sep Thu 16, 2021 7:30 pm 
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Joined: May Thu 17, 2018 12:16 am
Posts: 236
Location: Edmonds, WA USA
Voltages too high sounds odd to me. Current too high I could understand. What does "melted" mean in terms of symptoms. Please report back when you find the cause.

_________________
Dave
W7VM

Real Radios Glow in the Dark


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