At one point we had 3 of them working, and 3 rubidium clocks and 2 GPS disciplined 10 MHz oscillators... it was wild.
In theory, we could have run one upstairs, and one downstairs to see if we could check relativity... but the tubes have an finite lifespan, so it wasn't worth it.
The Cesium clocks have since been sold... and the memories remain.
