Comment by tverbeure

I believe it.

This DIY GPSDO has a self-heating PCB to keep the temperature constant: https://www.paulvdiyblogs.net/2023/06/gpsdo-version-4.html?m....

It’s a long blog post, but in the August 24, 2023 update, he mentions that the PCB temperature stays rock solid at 52.9C.