[Milsurplus] Smart People: Gassy tubes , again

[hwhall at compuserve.com]

    I remember those, but as I remember them, the rejuvenators were installed and left in place for the remaining life of the picture tube. It's easy to see how the higher temperature can comepensate for a cathode's waning emission ability. I don't understand how running the filament at boosted voltage for only 20 mins affects the getter function. Is it because the getter flash material gets hotter? If so, would longer times also make a greater difference for tubes with more gas?
 
   Wayne
WB4OGM
 
  
 
 -----Original Message-----
 From: Ralph Cameron <ramcam at magma.ca>
 To: milsurplus <milsurplus at mailman.qth.net>
 Sent: Tue, Dec 3, 2013 9:18 am
 Subject: [Milsurplus] Smart People: Gassy tubes , again
 
  
   
  
 One may remember the trick of restoring CRTs that had lost emission due  
 to filament contamination. Some of the so called "CRT" rejuvenators  
 boosted the filament voltage with directly heated cathodes to burn off  
 some of the accumulated "junk" in the vacuum. Most of this junk was  
 metal contaminants. A 10% boost in filament voltage for 15-20 mins may  
 help the getter. 
  
 Ralph 
 VE3BBM 
  
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