[time-nuts] Noisy Sulzer 2.5 - Suggestions?

Ed Palmer ed_palmer at sasktel.net
Thu Aug 18 12:29:01 EDT 2016

That's not something I would have expected.  Did you have to unsolder 
the capacitors to clean them up?


On 2016-08-18 10:00 AM, time-nuts-request at febo.com 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
> 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 theAlDev @ 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 bypassesalmost everything in the power supply.  Eventually, I plan to replace the batterieswith 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 compositionresistors.  Should I be looking at a wholesale replacement with metal film?  Maybejust in the oscillator and AVC areas?  Are there any other known trouble spots withthese oscillators?
>> I haven't been able to find any info on the 2.5.  The manuals and schematics for the5A and the 2.5B/C are some help, but the 2.5 is very different from the 2.5B/C.  Anyinfo would be greatly appreciated.
>> Thanks,
>> Ed

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