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Vishay Dale - unobtainium?
Vishay Dale - unobtainium?
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Old 20th March 2020, 07:25 PM   #11
Nisbeth is online now Nisbeth  Denmark
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Vishay Dale - unobtainium?
I get 3700+ hits for RN55 on mouser.dk, so plenty to choose from. However, they are not 1W and never have been, so if this is what you need you have to look elsewhere.

RN55 is 1/8W as mil-spec and 1/4W as industrial-spec (where they are also called CMF55). RN60 is 1/4W and 1/2W under same conditions (CMF60 as industrial).

If you are seriously concerned about the sound of resistors, then I'd suggest you order some different ones (Mouser is a good choice if you are in DK) and experiment.
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Old 20th March 2020, 07:50 PM   #12
indianajo is offline indianajo  United States
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Farnell US (newark) has 6830 lines of Vishay through hole resistors in stock.
Vishay recently retooled the line to make resistors smaller for the same wattage, and moved production to BRA IMHO. These smaller resistors may burn a paper PCB at rated wattage. But people want cheaper, every day. So old part numbers may be no longer available. Vishay metal film resistors used to come from THA. Multicomp (farnell house brand) still do, at least I got some from there last summer. I've found farnell house brands to meet advertised spec wherever they come from.
Cool trick to save money at farnell. Use the min max tool to accept resistors from nominal value -10% to +10%. Use min max on wattage too. I often find 1% end of bin resistors at the non-stock value costing 10-20% of the nominal value 10% tolerance ones. Often $1.20 a hundred for 500-600 mw ones.
The new vishays are so short, 1 W resistors are no longer rated 300 v for tube circuits. So watch that if building vacuum tube circuits, have to go up to 2 or 3 watts to get something that will hold off plate/grid voltage with dust+moisture on it.
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Old 20th March 2020, 11:04 PM   #13
FriedMule is offline FriedMule  Denmark
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Thanks to you, have I found most at Mouser. I did had to change to 500mV but that do I think is perfectly fine.


So thank you all for being so great!! :-)
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Old 23rd March 2020, 12:53 AM   #14
FriedMule is offline FriedMule  Denmark
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Vishay Dale RN is in several sizes, is there any sound / other difference?
Some values can you not get in RN65 but in RN55. The RN55 is way smaller then the RN65 even they both is set to be 500mW 1%.
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Old 23rd March 2020, 07:00 AM   #15
Nisbeth is online now Nisbeth  Denmark
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Vishay Dale - unobtainium?
Quote:
Originally Posted by FriedMule View Post
Some values can you not get in RN65 but in RN55. The RN55 is way smaller then the RN65 even they both is set to be 500mW 1%.
But we keep telling you that they are not the same rating?

If Mouser's system tells you that the RN55s are rated 500W then that is a mistake in their catalog data

And obviously size and tolerance has nothing to do with each other either.
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Old 23rd March 2020, 07:07 AM   #16
FriedMule is offline FriedMule  Denmark
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Thanks a lot, I did also not understand it. I have to have made a mistake but when I think I chose 500mW 1% Vishay and other parameters, the lot smaller RN55 did appear.
It's also not logical w


EDIT: Here are what Mouser says about a L6.1mm 2.27mm: CMF55220R00FHEK Vishay / Dale | Mouser Denmark
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