Another Wire-wound resistor question - UK Vintage Radio Repair and Restoration Discussion Forum

flyingtech55 · 26th Jan 2018, 8:58 pm

Hi folks

Going through a box of assorted bits and bobs an old tech. gave me, I came across these. There are three of them, identical and unused. Any ideas what they might have been used for (apart from the obvious of course). They have no services type arrows on them but that doesn't preclude ex-services origin.

I thought I might use them for dummy loads for my valve amplifiers although they are 12 ohms and may be inductive. They are rated at 90W!

TimR

Ed_Dinning · 27th Jan 2018, 9:19 am

Hi Tim, Welwyn and others made them for a variety of industrial applications.
Look in any industrial electoral or electronics cabinet and you will probably see them.

Ed

M0FYA Andy · 27th Jan 2018, 9:59 am

Definitely of services origin, 5909-99-024-1016 is the correct format for a Nato Stock Number (which replaced the three services own numbering systems). 99 says it is a UK number.
Other than that I can say no more, they are standard parts which could be used anywhere required.
Andy

ronbryan · 27th Jan 2018, 10:05 am

These Welwyn C44 resistors were marked as obsolescent in the 1970-71 Welwyn catalogue, so must be quite old. They were usually mounted in clips that Welwyn could have supplied.

I have two pages of data for the C series resistors if you want more information.

Ron

flyingtech55 · 27th Jan 2018, 5:04 pm

Thanks folks. I didn't recognise the four group number as an NSN. As I say, I think I'll use them as dummy loads for my valve amplifiers while I'm working on them. Presumably I can bolt wiring to the metal end caps using the existing clamp bolts.

Tim

26th Jan 2018, 8:58 pm	#1
flyingtech55 Octode Join Date: Nov 2005 Location: Ayrshire, UK. Posts: 1,096	Another Wire-wound resistor question Hi folks Going through a box of assorted bits and bobs an old tech. gave me, I came across these. There are three of them, identical and unused. Any ideas what they might have been used for (apart from the obvious of course). They have no services type arrows on them but that doesn't preclude ex-services origin. I thought I might use them for dummy loads for my valve amplifiers although they are 12 ohms and may be inductive. They are rated at 90W! TimR Attached Thumbnails __________________ All those moments will be lost in time, like tears in rain.

27th Jan 2018, 9:19 am	#2
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,194	Re: Another Wire-wound resistor question Hi Tim, Welwyn and others made them for a variety of industrial applications. Look in any industrial electoral or electronics cabinet and you will probably see them. Ed

27th Jan 2018, 9:59 am	#3
M0FYA Andy Nonode Join Date: May 2007 Location: Preston, Lancashire, UK. Posts: 2,511	Re: Another Wire-wound resistor question Definitely of services origin, 5909-99-024-1016 is the correct format for a Nato Stock Number (which replaced the three services own numbering systems). 99 says it is a UK number. Other than that I can say no more, they are standard parts which could be used anywhere required. Andy

27th Jan 2018, 10:05 am	#4
ronbryan Octode Join Date: Jan 2003 Location: Guildford, Surrey, UK. Posts: 1,959	Re: Another Wire-wound resistor question These Welwyn C44 resistors were marked as obsolescent in the 1970-71 Welwyn catalogue, so must be quite old. They were usually mounted in clips that Welwyn could have supplied. I have two pages of data for the C series resistors if you want more information. Ron

27th Jan 2018, 5:04 pm	#5
flyingtech55 Octode Join Date: Nov 2005 Location: Ayrshire, UK. Posts: 1,096	Re: Another Wire-wound resistor question Thanks folks. I didn't recognise the four group number as an NSN. As I say, I think I'll use them as dummy loads for my valve amplifiers while I'm working on them. Presumably I can bolt wiring to the metal end caps using the existing clamp bolts. Tim __________________ All those moments will be lost in time, like tears in rain.