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
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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