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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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19th Apr 2021, 3:35 am | #1 |
Triode
Join Date: Feb 2021
Location: Los Angeles, California, USA
Posts: 16
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Anyone seen these old 2% resistors before?
I'm trying to find out if these resistors are thick film resistors. This board was built in 1978 with all RS components parts, but from what I can tell, carbon film was not available at +/-2% back then. Anyone ever seen them before? They seem like a unicorn. I can't find any of them and I can't find any info about them.
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19th Apr 2021, 7:04 am | #2 |
Nonode
Join Date: Jun 2013
Location: Surbiton, SW London, UK.
Posts: 2,801
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Re: Anyone seen these old 2% resistors before?
Used to sell them ;
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19th Apr 2021, 7:48 am | #3 |
Dekatron
Join Date: Nov 2011
Location: Surrey, UK.
Posts: 4,385
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Re: Anyone seen these old 2% resistors before?
I remember Maplin selling these (or something very like them) way back in their early days, they looked disappointingly like cheap miniature carbon comps!
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19th Apr 2021, 8:36 am | #4 |
Banned
Join Date: Jun 2015
Location: Mareeba, North Queensland, Australia
Posts: 2,704
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Re: Anyone seen these old 2% resistors before?
Dont they just turretslug?
Joe |
19th Apr 2021, 6:53 pm | #5 |
Triode
Join Date: Feb 2021
Location: Los Angeles, California, USA
Posts: 16
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Re: Anyone seen these old 2% resistors before?
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19th Apr 2021, 8:10 pm | #6 |
Dekatron
Join Date: Sep 2003
Location: Near Swindon, North Wiltshire, UK.
Posts: 3,596
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Re: Anyone seen these old 2% resistors before?
Made by Neohm of Italy. The company’s symbol (Omega) is on the bandolier tape.
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19th Apr 2021, 8:25 pm | #7 |
Triode
Join Date: Feb 2021
Location: Los Angeles, California, USA
Posts: 16
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Re: Anyone seen these old 2% resistors before?
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19th Apr 2021, 10:38 pm | #8 |
Hexode
Join Date: Sep 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 472
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Re: Anyone seen these old 2% resistors before?
Used lots of these in the 1980s - very reliable and spot-on resistance values.
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19th Apr 2021, 11:58 pm | #9 |
Triode
Join Date: Feb 2021
Location: Los Angeles, California, USA
Posts: 16
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Re: Anyone seen these old 2% resistors before?
Are these the same size as the carbon-type resistors in equivalent watt value or are these smaller? i.e. is the size of the 0.5w thick the same as 0.5w carbon?
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20th Apr 2021, 1:11 am | #10 |
Nonode
Join Date: Jun 2013
Location: Surbiton, SW London, UK.
Posts: 2,801
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Re: Anyone seen these old 2% resistors before?
Not sure about U.S. sizes, but about half size, i.e. length 6.4mm, diameter 2.3mm.
I have also found I have some with 1% tolerance. |
21st Apr 2021, 7:32 pm | #11 |
Banned
Join Date: Mar 2021
Location: Morpeth, Northumberland, UK.
Posts: 936
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Re: Anyone seen these old 2% resistors before?
IIRC these were described as thick film metal glaze in the RS catalogue at the time.
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