Welwyn MR8F 2 Watt metal film resistors - UK Vintage Radio Repair and Restoration Discussion Forum

ColinTheAmpMan1 · 5th Sep 2019, 3:29 pm

Hi,

Does anyone have any details on this resistor series? I ask because I purchased a job lot of them recently and they are physically similar in size (18 x 8 mm), but come in four different body colours. The colours are brown, mid grey, pale blue and pale grey. The resistance values don't help, as some turn up with different body colours (1k8 can be brown or pale blue, 24R can be mid grey or pale grey). They all seem to be 1% tolerance, if the brown band signifies this.

I am guessing that they are good quality parts as they came from military stores surplus - perhaps the body colour means nothing of significance.

This forum constantly surprises and pleases me when people come up with details of components, so perhaps someone has info on these Welwyn resistors.

Colin.

Radio Wrangler · 5th Sep 2019, 5:26 pm

Should be first class components. Reliable, low noise and comfortably in spec.

We used their parts a lot and put all incoming components through statistical quality monitoring.

They will have a spiral cut to get their value and to permit adjustment in manufacturing them, so some values may be a little inductive for RF work.

Body colour varied over the years and we got light blue or brown. Colour code seemed clearer on the blue. I don't think there was any significance.

David

5th Sep 2019, 3:29 pm	#1
ColinTheAmpMan1 Octode Join Date: Jan 2012 Location: Wimbledon, London, UK. Posts: 1,465	Welwyn MR8F 2 Watt metal film resistors Hi, Does anyone have any details on this resistor series? I ask because I purchased a job lot of them recently and they are physically similar in size (18 x 8 mm), but come in four different body colours. The colours are brown, mid grey, pale blue and pale grey. The resistance values don't help, as some turn up with different body colours (1k8 can be brown or pale blue, 24R can be mid grey or pale grey). They all seem to be 1% tolerance, if the brown band signifies this. I am guessing that they are good quality parts as they came from military stores surplus - perhaps the body colour means nothing of significance. This forum constantly surprises and pleases me when people come up with details of components, so perhaps someone has info on these Welwyn resistors. Colin.

5th Sep 2019, 5:26 pm	#2
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,858	Re: Welwyn MR8F 2 Watt metal film resistors Should be first class components. Reliable, low noise and comfortably in spec. We used their parts a lot and put all incoming components through statistical quality monitoring. They will have a spiral cut to get their value and to permit adjustment in manufacturing them, so some values may be a little inductive for RF work. Body colour varied over the years and we got light blue or brown. Colour code seemed clearer on the blue. I don't think there was any significance. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done