Galaga screen issue - any ideas?

i would start with cleaning the edge connectors on the the PCB. i have seen streaking caused by dirty connectors that cleared up nicely once an eraser and a little elbow grease was applied to the contacts.

if that doesn't take care of it then a cap kit might be in order. since it's happening only on the bottom half of the screen i suspect it's not a simple adjustment.
 
From the dot pattern on the tube looks like a K4600 chassis?

While a cap kit may help, the separation on the bottom is a convergence issue on the tube. Also the streaks could be caused by overdriving the guns and require a drive and/or cutoff and/or screen control adjustment.
 
Also the streaks could be caused by overdriving the guns and require a drive and/or cutoff and/or screen control adjustment.

Yeah. I'd try turning down the contrast and/or brightness a bit first.
 
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