[tig] When to change the photo Multiplier tubes

Lisa Blanks lisablanks
Thu Jun 24 05:21:10 BST 2004

Wow ten years.....Dave he must have had the magic card!!!! Everyone is 
correct here and the most important issue is signal to noise ratio, the 
older the cathode the less electrons are emitted and the more the gain 
need tweaking.....boy am I showing my freakin' age(as my kids remind 
me)....and the visible noise is more prevalent.

Bob Blanks

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