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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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10th Sep 2021, 11:15 am
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#1 |
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Octode
Join Date: May 2017
Location: St Austell, Cornwall, UK.
Posts: 1,018
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Vintage Resistor Colour Code
Well, I never thought I would get stumped over a Colour Code
for a Resistor, but this one has me stuck! It doesn't appear to have a Body Colour, just Two Strips and a Dot. Green / Orange and a White Dot. I have measured it at very close to 50 K, but I can't make those Markings add up to 50K using conventional logic! My Circuit Diagram is for a slightly later model with a Different Valve, so the Resistor Value of 100K is probably not correct for my Bridge, but even if it was, the Colour Code wouldn't fit that either. Is anybody familiar with this type of coding? Ian |
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10th Sep 2021, 11:26 am
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#2 |
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Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Vintage Resistor Colour Code
Green Black Orange, 5-0-000, 50k.
Lawrence. |
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10th Sep 2021, 11:27 am
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#3 |
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Dekatron
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,127
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Re: Vintage Resistor Colour Code
I read that as a black stripe between the green and orange - which would be spot on for 50K.
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Mending is better than Ending (cf Brave New World by Aldous Huxley) Last edited by Dave Moll; 10th Sep 2021 at 11:27 am. Reason: Lawrence beat me by a nose! |
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10th Sep 2021, 11:34 am
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#4 |
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Octode
Join Date: May 2017
Location: St Austell, Cornwall, UK.
Posts: 1,018
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Re: Vintage Resistor Colour Code
Thanks Guys,
That of course makes complete sense. I never considered that was supposed to be a Black Strip in between. It actually isn't really, it's just the Body colour which is more grey than Black in real life. Still, it has certainly answered my question. What does the White Dot mean though? Ian Last edited by Superscope; 10th Sep 2021 at 11:39 am. |
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10th Sep 2021, 11:45 am
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#5 |
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Dekatron
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,127
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Re: Vintage Resistor Colour Code
Only a guess, but maybe the white is supposed to represent silver - i.e. 10% tolerance.
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Mending is better than Ending (cf Brave New World by Aldous Huxley) |
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10th Sep 2021, 12:14 pm
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#6 |
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Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,553
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Re: Vintage Resistor Colour Code
If that resistor has some old lacquer on it then it is likely to be green - yellow making it 50K with a two band marking.
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10th Sep 2021, 7:33 pm
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#7 |
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Octode
Join Date: May 2017
Location: St Austell, Cornwall, UK.
Posts: 1,018
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Re: Vintage Resistor Colour Code
Anything is possible of course, although it definately looks like it's always
been Orange. Funny, we now have Two different Solutions that both fit the Bill. Ian |
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10th Sep 2021, 7:38 pm
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#8 |
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Dekatron
Join Date: Oct 2003
Location: Croydon, Surrey, UK.
Posts: 7,572
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Re: Vintage Resistor Colour Code
Colours fade and change. I've been well and truly caught out by faded reds, yellows and oranges before. Reds can look brown, yellows can go orangey, oranges can go yellowy...I had what looked like a 47K go high.....well it hadn't as I discovered when I got the correct circuit....it was in fact a 470K but I could have sworn it was a 47K that I took out.....
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