CMF60 vs RN60

[FourT6and2]

What's the deal with these resistors? One data sheet lists CMF60 as being 0.5 watt, 500v. Another data sheet lists them as being the same as RN60 (one being industrial, the other military), at 1/4 watt and 300v. So which is it?

Are CMF60 and RN60 the same? Just different markings for mil vs ind.? Or are the RN60 really only 1/4 watt? Or are the CM60 actually 1/4 watt or what? So confusing.

Industrial data sheet: http://www.vishay.com/docs/31018/cmfind.pdf
Mil data sheet: https://www.vishay.com/docs/31027/cmfmil.pdf

Are they just de-rated for the military spec so they use the next model up to make sure nothing exceeds spec?

 

[russoloco]

Well, it's both. The RN60 is a more stringent method of testing. For amp building purposes the 1/2w rating @ 125 celsius is what I would roll with.

 

[FourT6and2]

Well, it's both. The RN60 is a more stringent method of testing. For amp building purposes the 1/2w rating @ 125 celsius is what I would roll with.

Ok so for guitar amps it's safe to assume RN60 are the same as CMF60 and are both 1/2-watt, 500v?

 

[russoloco]

Well, it's both. The RN60 is a more stringent method of testing. For amp building purposes the 1/2w rating @ 125 celsius is what I would roll with.

Ok so for guitar amps it's safe to assume RN60 are the same as CMF60 and are both 1/2-watt, 500v?

Yes. Unless you exceed the 125deg celsius rating which shouldn't happen under normal operations.