[Boatanchors] Carbon Comp Resistors: The Darkness Gathers?

[David Harmon]

The problem is....it might go bad tomorrow....
They suck up moisture, get noisy, physically crack due to physical stress, go open due to internal corrosion on the lead attach points, go open due to accumulated moisture heating up and then causing an internal crack.
Gasp.....there is likely more failure modes but these are a few of what I know about.
There is a reason why these things are not made anymore.

Modern resistors are sooo much better that they are almost not a concern anymore.

73

David Harmon
K6XYZ
Sperry, OK

-----Original Message-----
From: boatanchors-bounces at mailman.qth.net [mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of Rob Atkinson
Sent: Friday, July 6, 2018 8:49 AM
To: rls19 <rls19 at psu.edu>
Cc: boatanchors at mailman.qth.net; Donald Chester <k4kyv at hotmail.com>
Subject: Re: [Boatanchors] Carbon Comp Resistors: The Darkness Gathers?

I can't remember if I posted this or not but I don't think they drift with no current through them.  So for ham service which is intermittent, it will probably take a long time for a carbon resistor to drift.  The ones I find that have drifted are usually in gear that's 50+ years old.  Hate to throw shade on us but none of us will be around to see a drifted NOS carbon we install today.

Rob
K5UJ

On Thu, Jul 5, 2018 at 2:50 PM, rls19 <rls19 at psu.edu> wrote:
> It’s good to remember that the change in value is a continuing process. 20% off today may continue on to be even further off in the not so distant future.
>
> 73,
> Bob AD3K
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