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Actually that pic is simply horrible. And easy to fix.
There are two different schematics for the connections between the
vertical osc and amplifier: Sam's and Riders. Sam's has a 5.6 meg resistor
where Riders has two .0015uf caps and a resistor to ground.
Install the Sams circuit (check that resistor out of circuit) and add at least
another .01 uF in parallel
with each of the 3kV or higher .005 uf caps that
connect the vertical to the deflection plates. A total of .02uF is better.
Allied elec has good mylar caps for this, but if you use .02uf total
each, ceramic will work just fine (use 4, 6, or 10 kV ones), as
ceramics have nonlinearity problems only if they have lots
of AC across them, and at 0.02 there really isn't any.
See my thread about this in summer 2013.
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