This cheap power supply has been flaky for a while and finally broke completely. That stopped a valve from turning, which stopped the pulse tube used to keep my cryostat and the things inside cold (3 Kelvin and colder). I found another power supply, and restarted things. It will take about 2 days to get as cold as before. You can see the current temperature is around ice (~270 K), and is so hot that two of the thermometers aren’t working.