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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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18th Dec 2018, 9:21 am | #1 |
Tetrode
Join Date: Apr 2018
Location: Barcelona, Spain.
Posts: 62
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R1155 caps
Hello! I would like to replace the electrolytic caps as I always donon my old radios... but I see that R1155 doesn’t have any. Is that correct?
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EA3IAV Last edited by CesarLG; 18th Dec 2018 at 9:40 am. |
18th Dec 2018, 9:30 am | #2 |
Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,932
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Re: R1155 caps
Yes I believe you are correct apart from main smoothing electrolytic s in a separate power supply,there are possibly one or two smaller biasing caps.
Note this is without looking.
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18th Dec 2018, 9:58 am | #3 |
Tetrode
Join Date: Apr 2018
Location: Barcelona, Spain.
Posts: 62
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Re: R1155 caps
Thanks! What about the voltage rating on the picofarad ones?
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EA3IAV |
18th Dec 2018, 10:09 am | #4 |
Nonode
Join Date: May 2007
Location: Preston, Lancashire, UK.
Posts: 2,511
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Re: R1155 caps
No electrolytics in an R1155.
There are in the monster Air Ministry ground power supply, but that's another matter. Andy |
18th Dec 2018, 2:56 pm | #5 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,642
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Re: R1155 caps
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18th Dec 2018, 4:28 pm | #6 |
Nonode
Join Date: Oct 2008
Location: Warsaw, Poland and Cambridge, UK
Posts: 2,677
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Re: R1155 caps
My R1155 has (had) lots of metal-cased paper capacitors (branded TCC, I think) which look a bit like electrolytics. The ones in mine are hopelessly leaky, to the point of making fizzing bubbling noises due to electrolysis when HT was applied. They certainly needed replacing (I chose to restuff some because of their chassis mounting method) but they weren't electrolytic.
Chris
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19th Dec 2018, 8:46 am | #7 |
Tetrode
Join Date: Apr 2018
Location: Barcelona, Spain.
Posts: 62
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Re: R1155 caps
I have no problems with them I experience good reception and sound. But I think that the CW BFO setting is not performing at 100%... May it be due to that caps?
Where did you find that 2.5uf? I have just odered them but they are not easy to get
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EA3IAV |
19th Dec 2018, 9:43 am | #8 |
Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,932
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Re: R1155 caps
A 2.2uF is a perfect replacement for 2.5uF
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20th Dec 2018, 3:33 pm | #9 |
Heptode
Join Date: Jan 2003
Location: Tewkesbury, Gloucestershire, UK.
Posts: 693
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Re: R1155 caps
As Chris says, the double and triple tubular decoupling capacitors are usually leaky and will degrade the performance of the receiver. I ended up restuffing mine with modern polypropylenes which should solve the problem long term.
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Keith Yates - G3XGW VMARS & BVWS member http://www.tibblestone.com/oldradios/Old_Radios.htm |