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
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