AVR-Chat

Hello to all Experts,

I would like to refer to your information about oscilloscope CRTs. I
have to use a crt do display waveforms like an oscilloscope but having
really big problem with this sacred device. 
I used already available crt driver circuit with transistors and my
waveform seem very stable and nice when I inspect it on a scope, however
I cant get such stable view when I look into the CRT display I am trying
to drive.  The waveform flickers when I touch CRTs shield, its focus is
lost when I move the waveform vertically etc.  i.e. there are problems
with the physics of the device.
	I generally have focusing and grounding problems and also it is
very sensitive to noise for example,  from a pulse signal generated
somewhere else in the system. 

	Well, I would like to hear your experience on such issues, and I
really would like to know if there is already available chips to drive
such problemmatic device ,
	 and if there is any available chips to drive it like a
monochrome Graphic display? 
And also manuals tutorials on CRTs would be helpful, 

Thank you for your interest in advance...
Arif