Quote:
Originally Posted by 47'Plymouth
and yes the ion trap is missing do anyone of you have a spare..the original disappeared long time ago  
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If the trap is missing and the tube is supposed to have one you won't get anything on the screen until you replace it.
You might be able to get something by running a small magnet around the neck of the tube and seeing if the screen lights up
Data on the 21YP4:
http://www.google.com/url?sa=t&rct=j..._nhnig&cad=rja