[Milsurplus] Resistors

[Charlie L.]

I still have a ton of carbon, and always check them before I use them.  The
military versions with the green body seem to do better than others on
longevity.  I have tried on an experimental basis, to heat NOS out of
tolerance resistors in a 200 deg. over to dry them out, and they do return
to their marked value.  But after a period of time they again take in
moisture and go out of tolerance.  The body must have micro size cracks or
maybe where the lead enters, leaks air in.  To be honest, I am still not
sure about the modern resistors and their make up, metal film, carbon film,
etc.  Other than not using a wire wound in an inductive circuit, I do not
know or believe some of the claims, especially by audiophiles,  about what
resistor to use due to noise/   Plus, in our RX's and TX's, whether
composition makes a difference, or to worry about noise in audio bandwidth
where our concern is in the voice intelligibility spectrum of 300 to
3000HZ..  I will say one thing about new resistors, the banding on some,
especially the dark blue  one is impossible to decode, the blue body
obscures the real color, and now I have to double check what I think it is
with an ohm meter.  Also, if I do not keep my orders in the bag they came
in or in marked storage, the modern 2 watt resistor is the size of a 1/2
watt  carbon, while not an issue due to the wattage in a circuit less than
2 watts, don't like to waste a 2 watter where a 1/2 watt is all I need.

Charlie W4MEC in NC
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