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Old 4th June 2010, 09:54 PM   #1
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Default Affordable non-magnetic resistors

Which resistors are non-magnetic and affordable?
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Old 5th June 2010, 12:09 AM   #2
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All resistors are nonmagnetic, except some special types.
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Old 5th June 2010, 12:24 AM   #3
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AFAIK, for many resistors, the leading wires are magnetic.
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Old 5th June 2010, 12:29 AM   #4
davada is offline davada  Canada
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Originally Posted by Joshua_G View Post
Which resistors are non-magnetic and affordable?
When you say nonmagnetic do you mean noninductive?

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Old 5th June 2010, 12:38 AM   #5
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Originally Posted by bob91343 View Post
All resistors are nonmagnetic, except some special types.
Sorry, completely wrong.

Most resistors ARE magnetic, because they have steel leads, and even if they have copper leads, they still have steel end caps that join the wires to the resistive element. The test is to use a very strong magnet and see if you can move, or even pick up the resistor.

A very few modern resistors are non magnetic, one being the original HOLCOs, but the easiest to get these days are the Dale/VISHEY brown ones, don't remember the number - but we buy them from www.Schuro.de.
They are about 0.50 each, and are well worth it.

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Old 5th June 2010, 01:10 AM   #6
tinitus is offline tinitus  Europe
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Originally Posted by Allen Wright View Post

the easiest to get these days are the Dale/VISHEY brown ones, don't remember the number
CMF-55
http://www.hifituning24.de/downloads/cmf55ind.pdf

hey, and remember to use a non-magnetic screwdriver when adjusting bias etc
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Old 5th June 2010, 01:18 AM   #7
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Originally Posted by tinitus View Post
I just stuck one of those fast to a magnet. The leads are copper but the end caps are clearly steel.

However, the CMF50's that I have are essentially non-magnetic. That doesn't mean I know anything about future production.
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Old 5th June 2010, 04:01 AM   #8
pooge is offline pooge  United States
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Originally Posted by Joshua_G View Post
Which resistors are non-magnetic and affordable?
PRP resistors:

http://www.prpinc.com/pdf/Audio_PR9372_Series.pdf
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Old 5th June 2010, 04:07 AM   #9
sonidos is offline sonidos  United States
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Try Dale RN-60s, the mil-spec versions that you can get at Mouser. I've used a magnet on several resistors, including some old Roderstein's and Holco's (well, from early 1990) and they move right to the magnet.

I've had CMF55's move under the magnet, but I can't recall an RN60 or above moving at all.
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Old 5th June 2010, 08:14 AM   #10
MRupp is offline MRupp  Germany
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I just stuck one of those fast to a magnet. The leads are copper but the end caps are clearly steel.
http://www.hifituning24.de/downloads/cmf55ind.pdf clearly states that they are non-magnetic.

Then if you read the man's original home pages at schuro.de it will tell you that he comissioned a non-magnetic version of this resistor from Vishay. This is after he found that most but not all of the previous resistors he got from Vishay were magnetic. He's been selling these for quite a few years.

P.S. I have some magnetic Roederstein MK3 and built simple voltage dividers of both the non-magnetic CMF55 and the magnetic MK3s then hooked up my CD player to my power amp via the voltage divider. I "believe" the Roedersteins have slightly more resolution and crisper highs than the Vishays but the difference is small and I may be deluding myself.
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