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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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12th Aug 2019, 4:18 pm | #1 |
Heptode
Join Date: Feb 2011
Location: Sheerness, Kent, UK.
Posts: 936
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Capacitor information required.
I am rebuilding an old home made TRF radio.
This radio contains some silver mica capacitors that have no value marked. One of these has a wire fractured off, so it is useless. However these capacitors do have some code numbers that I would thing are military, maybe USA. The one with the fractured wire is marked 10C2076. Some while back I remember seeing reference to a list of these numbers and corresponding values. Now I do not remember where I saw this, and cant seem to find it again. Has anybody an idea as to where one might find such a list? Thanks, Regards Dave. |
12th Aug 2019, 4:24 pm | #2 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Capacitor information required.
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12th Aug 2019, 4:32 pm | #3 |
Heptode
Join Date: Feb 2011
Location: Sheerness, Kent, UK.
Posts: 936
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Re: Capacitor information required.
Hi Lawrence,
That was a quick reply, thank you very much. I did find that receiver information earlier today, but did not look through it all. Problem solved. Regards Dave. |
12th Aug 2019, 4:38 pm | #4 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Capacitor information required.
It was the 10C ref. that caught my eye.
Lawrence. |
12th Aug 2019, 4:41 pm | #5 |
Nonode
Join Date: May 2007
Location: Preston, Lancashire, UK.
Posts: 2,510
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Re: Capacitor information required.
The document you are thinking of is AP1086, the RAF Vocabulary of Stores.
Section 10C tells us that 10C/2076 is a Fixed Condenser, Mica Dielectric, Moulded, Type 966, 300pf, +/-15%, 350v working, 1000v test. Andy |
17th Aug 2019, 4:29 pm | #6 |
Heptode
Join Date: Feb 2011
Location: Sheerness, Kent, UK.
Posts: 936
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Re: Capacitor information required.
Hello Andy,
Thanks for the information. Is that document available from anywhere. I have a faulty pot with the number 10C/18*8 the star I think is a Q Thanks Dave. |
17th Aug 2019, 5:29 pm | #7 |
Nonode
Join Date: May 2007
Location: Preston, Lancashire, UK.
Posts: 2,510
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Re: Capacitor information required.
Dave,
AP1086 is a ginormous document, getting hold of some Sections is impossible, others are available online. Fortunately Section 10C is available from VMARS, http://www.vmarsmanuals.co.uk/archive/files_index.htm Pots should come under Section 10W, but I have seen them erroneously marked as 10C. Look at documents 3225/6/7/8. Q wouldn't make sense, it should be a digit. Andy |
17th Aug 2019, 8:09 pm | #8 |
Heptode
Join Date: Feb 2011
Location: Sheerness, Kent, UK.
Posts: 936
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Re: Capacitor information required.
Hi Andy,
Thanks for that, I will see how I go with downloading the document. The number certainly had a tail just like a Q, however I wet it slightly and it rubbed away without disturbing what was underneath, it could be another 8 or a 0. I have the downloads, thank Andy. Dave. Last edited by davidgem1406; 17th Aug 2019 at 8:23 pm. |
17th Aug 2019, 8:59 pm | #9 |
Heptode
Join Date: Feb 2011
Location: Sheerness, Kent, UK.
Posts: 936
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Re: Capacitor information required.
I checked the documents and found my answer 10c/1808 is a 20K 3W pot. It is the only number in that section starting with 18. The quoted size ties up also. Although the pot has 2 track of, as far as I could measure, of 20K each.
Dave. |