[Boatanchors] Carbon Comp Resistors: The Darkness Gathers?

[Mark K3MSB]

Hmmmmm.     I've seen numerous posts about the baking method over the years
that report the resistors will rise back up in value a few months
afterwards.    It is postulated that the absorbed moisture changed the
resistor composition so as to make it always easier to reabsorb moisture.

With modern resistors,  I've never felt the need to bake carbon comps.    I
guess they're good for authenticity's sake,  but I've never, ever, had
someone come into m shack and ask to take a peek under the skirts of any of
my radios.    When I remove "authentic" parts under the chassis and replace
with modern parts,  I simply bag the "authentic" parts for the next owner.

YMMV (and probably will).

73 Mark K3MSB

On Mon, Jul 2, 2018 at 6:45 PM, Francesco Ledda <frledda at att.net> wrote:

> You are spot on! A night cooking in the oven at 200F will do the trick!
>
> -----Original Message-----
> From: boatanchors-bounces at mailman.qth.net
> [mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of Marvin Match
> Sent: Monday, July 2, 2018 5:43 PM
> To: boatanchors at mailman.qth.net
> Subject: Re: [Boatanchors] Carbon Comp Resistors: The Darkness Gathers?
>
>  From memory, which is not always reliable at my age:
>
> I seem to remember that carbon comps are hygoscopic, meaning they absorb
> moisture. If you have a stock of NOS carbon comps that have drifted
> high, try baking them in the oven. 300 for a couple hours ought to do it.
>
> Marvin KA7TPH
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