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." 73 Eugene W2HX Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos -----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
