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 Ed Palmer wrote: > I picked up a Sulzer 2.5 (not 2.5A or 2.5B or 2.5C) oscillator and 5P power > supply. > It's working, but the AlDev at low tau is poor. After a few days of operation > the > AlDev @ 1sec. is only 1e-10. It's not the power supply. I'm running under > 'AC fail' > conditions with a lab power supply standing in for the batteries. This > bypasses > almost everything in the power supply. Eventually, I plan to replace the > batteries > with lead-acid and replace the circuit board with an improved circuit. > > So, I'll be opening up the oscillator to see what's what. My first 'usual > suspect' > will be the Ta capacitors, but I'm wondering about all those carbon > composition > resistors. Should I be looking at a wholesale replacement with metal film? > Maybe > just in the oscillator and AVC areas? Are there any other known trouble > spots with > these oscillators? > > I haven't been able to find any info on the 2.5. The manuals and schematics > for the > 5A and the 2.5B/C are some help, but the 2.5 is very different from the > 2.5B/C. Any > info would be greatly appreciated. > > Thanks, > > Ed > > _______________________________________________ > 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.
