Is there any way to stop the glowing dot ?

[kramden66]

I have two 60s zenith sets and they both have the glowing dot with halo after shut off , is there any way to prevent the set from doing this ?
I know if you pull the socket off the CRT and then shut down it won't do it , thought of putting a switch on the filament wire and just flicking it before shut off but there must be a better way.