After the death of my chinese-import digital multimeter, I used an old ICE analogic multimeter and I measure 400V on the cathode of damper. Low, but good for now. Tomorrow I try with another multimeter, for better control
http://imageshack.us/photo/my-images/829/westhor.jpg/
http://imageshack.us/photo/my-images/338/dsc05004v.jpg/
And now, time to LOL. The CRT was rebuilt in Italy, and the label on the neck says "without ion trap". But...
http://imageshack.us/photo/my-images/339/dsc05000a.jpg/