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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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3rd Apr 2016, 2:50 pm | #1 |
Heptode
Join Date: Apr 2015
Location: Manchester, UK.
Posts: 709
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Hallicrafters S27 caps.
Hi all. Yesterday I decided to have a close look at my s27 and found ten tcc metalmite visconol electrolictics values 0.02 0.05 and 0.01uf . whilst looking on the net a came across a restored s27 and the tcc caps had been replaced with the usual yellow 630 volt non polarised caps is this right ? Cheers Chris .
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3rd Apr 2016, 2:56 pm | #2 |
Dekatron
Join Date: Feb 2005
Location: St.Ippolyts, Hitchin, Hertfordshire QRA IO91UW
Posts: 3,517
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Re: Hallicrafters S27 caps.
Would make sense to me, Ive given up using anything else now.
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Engineers make things work and have spare bits when finished |
3rd Apr 2016, 3:18 pm | #3 |
Heptode
Join Date: Apr 2015
Location: Manchester, UK.
Posts: 709
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Re: Hallicrafters S27 caps.
Cheers Sean I just thought they could be issues using non electrolictics I shall order a bag full of yellows thanks again .
Last edited by deliverance; 3rd Apr 2016 at 3:35 pm. Reason: members name wrong |
3rd Apr 2016, 3:59 pm | #4 |
Dekatron
Join Date: Feb 2005
Location: St.Ippolyts, Hitchin, Hertfordshire QRA IO91UW
Posts: 3,517
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Re: Hallicrafters S27 caps.
None of the caps you mention will be electrolytics, in fact I think the only electrolytic in the S27 would be the output valve cathode bias cap and possibly the main smoothing block.
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Engineers make things work and have spare bits when finished |
3rd Apr 2016, 5:01 pm | #5 |
Dekatron
Join Date: Nov 2011
Location: Surrey, UK.
Posts: 4,385
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Re: Hallicrafters S27 caps.
Are these the types that have a red rubber bung at one end and a black ditto the other?- these are quite common in British vintage kit, questions occasionally surface over their nature. Not sure why they chose to do this on these non-polarised components, though it's possible that the black bung indicated the foil nearest the insulated metal sleeve for shielding sake. This assumes "conventional" valve circuit practice of +ve HT and -ve to chassis.
Also, both "TCC" and "Visconol" are very British in manufacture, which is odd in a US radio- perhaps a previous owner had re-capped it, or maybe a military-use set would have been workshop overhauled during its time. I use a lot of 630V "yellows", too, and don't find them objectionable, though some find them jarring. Whoever makes them (there are both Vishay copper-lead and no-name, likely Chinese, steel-lead types) must be doing well out of us lot.... |
3rd Apr 2016, 6:07 pm | #6 |
Heptode
Join Date: Apr 2015
Location: Manchester, UK.
Posts: 709
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Re: Hallicrafters S27 caps.
Yes the caps have red and black rubber ends with a plastic clear cover over them . They must of been changed years ago , I have a few Hallicrafters and only seen wax and bumble bee caps apart from the obvious ones .
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