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Phil M0OFX

@tubetime Why does that CRT have an electrode in the centre? I've never seen one like that.

9 Jul 2023 at 2:18 | Wall-to-wall | Open on digipres.club
2 comments
Tube🍂Time

@philpem radial deflection. used for J-scope radar

9 Jul 2023 at 2:55 | Open on mastodon.social
Crazy Pony

@tubetime @philpem
Types like the soviet 8LO30I

You run the XY plates to display a circle, and the inner pin (versus an ring that is not visible) for radial deflection, like pointers on a clock

9 Jul 2023 at 5:58 | Open on rubber.social
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