These SSAs are fairly rare items as they weren't produced in high qty by Agilent and they were quite expensive when new. I think they were $80k to $90k new. So you might not find one even in a large and well equipped lab.
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I'm probably going to take the ATX power supply apart and check the electrolytic caps in it. There may also be some tired connections inside. The average power consumption is about 220W which probably puts quite a strain on the ATX PSU over a two decade timespan.
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