[Boatanchors] Old resistor values

[Yong Surk Lee]

I want to try baking my old resistors to restore the original values.
What temperature and time should I use? Anybody knows the source of that
baking method? Any article published?
I hope my wife will not complain of using the kitchen oven for this purpose.
----- Original Message ----- 
From: "Mark Bell" <bell at blazenet.net>
To: <k4oah at mindspring.com>; "Yong Surk Lee" <yonglee at yonsei.ac.kr>
Cc: <boatanchors at mailman.qth.net>
Sent: Wednesday, December 15, 2004 12:18 PM
Subject: Re: [Boatanchors] Old resistor values


> I've have also heard the oven claim.  With it comes the statement that the
> resistance will start to climb again after the bake, but slowely, and it
> will not reach the original (too high) value.
>
> I wonder if you can hollow out the old carbon comps and insert the new
metal
> film ones, as the film ones are much smaller than their carbon comp
> equivalent.
>
> 73 Mark K3MSB (Think snow....)
>
>
>
>
> ----- Original Message ----- 
> From: "Garey Barrell" <k4oah at mindspring.com>
> To: "Yong Surk Lee" <yonglee at yonsei.ac.kr>
> Cc: <boatanchors at mailman.qth.net>
> Sent: Tuesday, December 14, 2004 9:47 PM
> Subject: Re: [Boatanchors] Old resistor values
>
>
> > The increase in value is often a result of storage in high humidity.
> > Some have claimed that baking in an oven to drive out the moisture will
> > recover them, but ...
> >
> > I don't think anyone has made carbon comp resistors for several years.
> > Most now are carbon or metal film deposited on a ceramic core or ceramic
> > composition.  These are very stable.
> >
> > 73, Garey - K4OAH
> > Atlanta
> >
> > Yong Surk Lee wrote:
> >
> > >Thanks for your reply. So do you think the carbon comp resistors
recently
> > >made are OK? I also have many resistors that I bought about 14 years
ago.
> > >These  does not show significant change in values.
> > >
> > >----- Original Message ----- 
> > >From: "Ted Minchin, ZL1MT." <tedm at xtra.co.nz>
> > >To: <boatanchors at mailman.qth.net>
> > >Sent: Wednesday, December 15, 2004 11:16 AM
> > >Subject: Re: [Boatanchors] Old resistor values
> > >
> > >
> > >
> > >
> > >>Yep, I have found that ALL the carbon comp resistors made in the 50's
> and
> > >>
> > >>
> > >60's increase resistance with age, used or not.... My view is that they
> are
> > >pretty to look at but best not used!!
> > >
> > >
> > >>73 de Ted
> > >>ZL1MT
> > >>
> > >>
> > >>
> > >>>From: "Yong Surk Lee" <yonglee at yonsei.ac.kr>
> > >>>Date: 2004/12/15 Wed PM 02:56:31 GMT+13:00
> > >>>To: <boatanchors at mailman.qth.net>
> > >>>Subject: [Boatanchors] Old resistor values
> > >>>
> > >>>
> > >>>I found thousands of NOS resistors ranging from 1ohm to a few megohms
> at
> > >>>
> > >>>
> > >a
> > >
> > >
> > >>>local hamfest. I believe these were made by Ohmite in the 50s or 60s.
> > >>>
> > >>>
> > >These
> > >
> > >
> > >>>resistors are unused. Strangely measured values of most of these
> > >>>
> > >>>
> > >resistors
> > >
> > >
> > >>>are about 10-20% higher than color coded values. Most of these are
> > >>>
> > >>>
> > >0.25-2
> > >
> > >
> > >>>watt and 5 or 10% tolerence resistors.
> > >>>Here is my question. Does the resistor values increase as time passes
> > >>>
> > >>>
> > >even
> > >
> > >
> > >>>if unused? Anybody experienced this?
> > >>>
> > >>>
> > >>>
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