Here's a CRT I wish I had, you can see all inside and the deflection plate connections are brought out to the side to minimise capacitance. A Philips DG16-1. Datasheet attached.
CRT site I got the photo from..
http://www.crtsite.com/page3.html
Datasheet from here, not just CRTs, but ALL types of vavles/tubes. Choose the server nearest you (first page).
http://www.tubedata.org/
If there's a little 'marker' next to the tube/valve type, click that to see a photo of that device, sometimes more than one.
Steve A.