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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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17th Feb 2020, 12:12 pm | #1 |
Heptode
Join Date: May 2015
Location: Chatham, Kent, UK.
Posts: 963
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Hallicrafters S38
Hi i have this s38 it now works But the range 1 and 2 aerial coils are burnt they are black and open circuit do i dismantle (not an easy job ) and rewind or use cap coupling to top of tuned circuit , using this it seems rather deaf. What would you do please? Mick
Last edited by mickm3for; 17th Feb 2020 at 12:17 pm. |
17th Feb 2020, 1:57 pm | #2 |
Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,932
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Re: Hallicrafters S38
Rewinding would of course be best.Wonder what caused the burn up.Just a thought ,could you fit replacements anywhere else?
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17th Feb 2020, 2:40 pm | #3 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,996
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Re: Hallicrafters S38
If you can find a "full" manual for the receiver, it may include details of the coil inductances, which would make rewinding a bit easier.
As to why they've 'cooked', is it a live-chassis AC/DC receiver? If so, I wonder if it could have been wired with the chassis 'live', then the aerial was earthed and the coils got to pass mains-current? Quite a few US radios tried to get round the 'live chassis' thing by using a negative-rail bus-bar which was not connected to the chassis except via a small RF-bypass capacitor (1000pF or so) and a parallel receiver (100K?) to act as a static-bleed. If the bus-bar is inadvertently shorted to the chassis, or the RF-bypass capacitor goes short-circuit, it can lead to the antenna-coil being zapped,. |
17th Feb 2020, 5:57 pm | #4 |
Heptode
Join Date: Jan 2008
Location: Birchington Kent, UK.
Posts: 596
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Re: Hallicrafters S38
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Regards Pete |
17th Feb 2020, 6:38 pm | #5 |
Heptode
Join Date: May 2015
Location: Chatham, Kent, UK.
Posts: 963
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Re: Hallicrafters S38
Hi this manual is readable as to numbering on coil its the mw and topband coils that are burnt. the cap to chassis is s/c so likley live chassis to ground via the 2 coils as r1 is also crispy/missing. I hope no one was hurt. This seems to have been used in the uk as on the tuning dial is has Home Light AFN and Hilversham marked on dial it is still 110volt in but had a 13a plug fitted. The rx had an oc heater in the rectifier tube the pilot lamp also oc as was the 330ohm across the pilot lamp not forgetting the exploded smoothing block. purchased from that bid site saying "it lights up" yes i bet it did. With the readable manual i am going to remove the coil and rewind Mick
Last edited by mickm3for; 17th Feb 2020 at 6:40 pm. Reason: missed part out |
22nd Feb 2020, 3:38 am | #6 |
Heptode
Join Date: Oct 2005
Location: Olympia, Washington, USA.
Posts: 664
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Re: Hallicrafters S38
Please keep in mind the Hallicrafters S38 series is also, sadly, prone to silver mica disease and poor insulation on the IFT's.
(Actually, most of the Hallicrafters are prone to this. I had a large collection of them of assorted models and offed the whole pile, as I was tired of repairing the IFT's.) SMD caps do work good for replacing the silver mica caps in the IFT's. |
22nd Feb 2020, 2:25 pm | #7 | |
Heptode
Join Date: Nov 2018
Location: London SW16, UK.
Posts: 655
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Re: Hallicrafters S38
Quote:
I would not enjoy replacing the caps in IFs either. |
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22nd Feb 2020, 6:20 pm | #8 |
Heptode
Join Date: Apr 2009
Location: Scratby, Norfolk, UK.
Posts: 650
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Re: Hallicrafters S38
Hi,
Yes, you're right about the costs. There's an S38c in the States on eBay at the moment, and the total cost is around £158 to include import duty and shipping. The current price of the set itself - £54.01! Not much of a set as I remember, but you might come across one in the UK cheaply. Kind regards Dave |