IV-9 Numitron Clock Flickering Issues
... The issue is that the tubes refuse to stay lit - with each refresh some tubes become dimmer and then go out altogether. However, if I place my finger on an open wire, or even an exposed metal part on the raspberry pi, all tubes instantly work fine, with no flickering whatsoever. Adding to my confusion is that if I move my hand closer to the rig, without touching, the tubes react and become brighter. 


This sort of thing is often caused by a floating line that should not be - maybe an enable line or an input that is being driven by noise.