I got a power supply from eBay a while ago:
That’s an HP 6255A: 2x 0..40V @ 1.5A, max 80V in series. But the interesting spec is its very low noise: <0.5 mV and <0.2 mA.
These supplies are very clean - and it’s all done with old-school linear regulation. So there can be a lot of heat to get rid of:
That back section is painted in RED for a reason: it contains some resistors which act as energy radiators.
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