i love the hp 6525A that we have at work
it's such a... Thing
weird box with dials on it on the bench with a couple wires sticking out
ridiculously heavy
makes a continuous ticking noise when plugged in (if the dials are set to anything other than 0000)
still works perfectly (if a bit out of calibration) when it's about 60 years old
they don't make things like that anymore
-F
it's a high voltage power supply, 4 kV/50 mA (max of 2 kV from ground, but the output is floating so you can do ±2 kV for a total of 4), and it's from an era where they advertised it being fully solid-state as a big selling point
and honestly that is a big selling point now, too; getting old equipment that uses tubes is always a pain because sometimes the tubes need replacing and sometimes they're ones that you can't get anymore
would love to have the schematics for it
-F
that flyback transformer is the source of the ticking i mentioned earlier, by the way. under no load it operates at about 1~4 Hz depending on the set voltage, making a tick every time it switches, and as the load increases it ticks more, up to a maximum of something around 3~4 kHz (by our ear, anyway--we don't have perfect pitch so this is a very rough estimate)
it's quite something to look inside
-F