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Scanner CRT's

Has anyone been experiencing reduced tube life from one popular vendor of 
Mark3 scanning crt's? Normally with this vendors crt  we would receive 
approximately one year of operation before experiencing beam current 
drift and focus fluctuations (cathode poisoning). Within the last two 
years we have seen tube life drop to approx. six months.  I've checked 
for heater voltage and high voltage problems but both look fine. We have 
two telecines in operation and have used crt's from other vendors with 
results similar to what we use to see, one year of life. Can some please 
shed some light on this issue.

Larry Anderson
Allied Digital Technologies