Chuck I know those capacitors and you are right they were very high quality way back when. Really interesting on the whiskers. I have seen them on other parts. What is it the tin leaching out. I guess the funny thing was that I have seen them before and just brushed them off and continued troubleshooting. Regards Paul WB8TSL
On Thu, Aug 18, 2016 at 2:46 PM, Chuck Harris <[email protected]> wrote: > Hi Ed, > > Nope. I just brushed off the growth, and blew the whole > assembly down with compressed air. The whiskers were > huge! I think they were capacitively coupling with the > ground bits, and since their size and number varied in > an uncontrolled way, they affected the frequency in an > unstable way. > > These white cube shaped capacitors are something high > quality. The white color is a porcelain glaze that protects > the capacitor, and the wires seemed to be connected to > some sort of sintered silver area on the body. > > -Chuck Harris > > Ed Palmer wrote: > > That's not something I would have expected. Did you have to unsolder > the capacitors > > to clean them up? > > > > Ed > > > > On 2016-08-18 10:00 AM, [email protected] wrote: > >> My old 2.5A was acting up in strange drifty ways. I opened the oven, > and found > >> that all of the white cube shaped ceramic capacitors in the oscillator > were covered > >> with fuzz on the electrode ends. I am guessing that they were growing > a great > >> tin whisker beard. I cleaned it all off, and performance improved > greatly. > >> > >> -Chuck Harris > >> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
