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| Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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Thread Tools |
7th Dec 2021, 3:24 pm
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#1 |
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Rest in Peace
Join Date: Mar 2010
Location: Berkshire, UK.
Posts: 72
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47 markings on WW 2 capacitors
I recollect a thread on this subject being discussed some time ago but I have been unable to find it so hopefully somebody can help.
Numerous WW 2 components, particularly RAF, have in addition to their values or stores numbers the number 47 included. The pictures below show two examples, a waxed paper and a pear drop capacitor (far left on the pear drop). Numerous possibilities spring to mind, approval level or specific manufacturer. Hopefully somebody knows the answer. Chris |
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7th Dec 2021, 6:07 pm
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#2 |
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Nonode
Join Date: May 2007
Location: Preston, Lancashire, UK.
Posts: 2,511
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Re: 47 markings on WW 2 capacitors
Some more examples.
Andy |
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7th Dec 2021, 10:30 pm
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#3 |
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Dekatron
Join Date: Feb 2003
Location: Cottingham, East Yorkshire, UK.
Posts: 5,761
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Re: 47 markings on WW 2 capacitors
Just a guess - maybe a date code?
‘47’ = 1947, ‘E’ = May. (Letter E being 5th in alphabet, so = fifth month).
__________________
David. BVWS Member. G-QRP Club member 1339. |
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7th Dec 2021, 10:44 pm
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#4 |
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Nonode
Join Date: May 2007
Location: Preston, Lancashire, UK.
Posts: 2,511
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Re: 47 markings on WW 2 capacitors
I don't believe it is a date code, or we would see other numbers just as often, which we don't see marked in this way.
Andy |
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8th Dec 2021, 11:20 am
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#5 |
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Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: 47 markings on WW 2 capacitors
TCC.
Google> vintage wharfdale 47e ? Lawrence. |
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8th Dec 2021, 1:18 pm
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#6 |
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Octode
Join Date: Mar 2016
Location: Knutsford, Cheshire, UK.
Posts: 1,495
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Re: 47 markings on WW 2 capacitors
Might be a supplier code?
TCC was a big supplier then, so if seen on different parts that might be a possible answer
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...where on earth did that spring/screw go?? |
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8th Dec 2021, 3:02 pm
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#7 |
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Rest in Peace
Join Date: Mar 2010
Location: Berkshire, UK.
Posts: 72
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Re: 47 markings on WW 2 capacitors
Thanks for that Lawrence TCC sounds reasonable although I have never associated them with the "pear drop" shown in the picture above.
That particular capacitor does not fit in with the normal range as it has a length of 18-20mm and diameter of around 16mm. Unfortunately the RAF stores number is partially obliterated 10C/3xx3. Chris |
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