On Sun, Apr 23, 2023, 3:56 PM W2HX via cctalk <cctalk@classiccmp.org> wrote:

> I might be concerned about putting carbon comp resistors in the dishwasher
> as they are hygroscopic.
>
> From an Ohmite datasheet:
> https://www.mouser.com/datasheet/2/303/res_od_of_oa-180619.pdf
>
> "Carbon composition resistors are highly hygroscopic and
> changes in resistance value can occur if too much moisture is
> absorbed. For this reason, it is recommended not to use water
> or water-soluble solvents to clean these components. Alcohol
> or hydrocarbon solvents are recommended for rinsing."
>

Years ago, I worked at a place that made their own boards in house. They
had a dishwasher for that. They had valve on it to disconnect the water
supply so they could fill it with alcohol or similar for special jobs.

Warner

73 Eugene W2HX
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>
>
> -----Original Message-----
> From: KenUnix via cctalk <cctalk@classiccmp.org>
> Sent: Sunday, April 23, 2023 5:53 PM
> To: General Discussion: On-Topic and Off-Topic Posts <
> cctalk@classiccmp.org>
> Cc: KenUnix <ken.unix....@gmail.com>
> Subject: [cctalk] Re: flipchip cleaning and pin corrosion inhibition
>
> Pete,
>
> Did the 8E have core or solid state memory?
>
> Ken
>
>
> On Sun, Apr 23, 2023 at 4:06 PM Pete Turnbull via cctalk <
> cctalk@classiccmp.org> wrote:
>
> > On 23/04/2023 17:54, Fritz Mueller via cctalk wrote:
> >
> > > I’ve been eying the dishwasher, for the subset of flip chips that
> > > that
> > are just DIP logic, carbon comp resistors, and ceramic bypass caps,
> > anyway.   But I haven’t been brave enough to try that yet...  Most of the
> > logic here has date codes to ’68 or ’69, so I’m inclined to treat it
> > gently.  Any suggestions for approaches to clean this up?
> >
> > I've used the dishwasher on a collection of PDP-8/E boards with success.
> >   Avoid the hot drying cycle, and don't use a harsh dishwasher
> > detergent; some are quite caustic.
> >
> > --
> > Pete
> > Pete Turnbull
> >
> >
>
> --
> End of line
> JOB TERMINATED Okey Dokey
>

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