Delta gun color CRT's are the first built. Delta comes from
the Greek letter delta which is a triangle. The three guns
are placed 120 degrees apart, usually blue on top. As tom said
the went away by the early 80's.
In line like yours all guns are in a strait line. Look at the neck
when its running you can see it.
In the end deltas will probably live longer. Some are 60 yrs old
& still going. Probably due to larger parts & the quality they
were made at.
On edge convergence leave everything tight. Remove the wedge
on the side its off. Bend the edge of yoke lightly & you will
see it change. If the yoke needs to be closer to the CRT
you may have to move the yoke forward to wedge it & also
may need to touch up the other side.
73 Zeno
