Distance Between CRTs

[Eric H]

In a word, no.

It's possible that it could cause some r.f. interference, or purity issues on a color set if the stray magnetic field from the speaker or degausser is close enough to affect it, but permanent damage is unlikely.

They used to be displayed in stores in close proximity to one another with no problems.

[zeno]

Sets that used the first RCA in line tubes could cause distortion
on the bench if close to another set & almost back to back.
On the sales floor portables were crowded side to side,
on top of consoles or on a 6 19" display. No effect seen there.
Only effect you may see would be purity but that would go
away with a few cold starts.
In other words not to worry...........

73 Zeno
LFOD !