[time-nuts] Noisy Sulzer 2.5 - Suggestions?
cfharris at erols.com
Thu Aug 18 00:06:54 EDT 2016
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.
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.
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