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Running THREE 3-500z's at 4.2 volts on the filament
FWIW we always managed the filament voltage on our 4CX5000 in our old Gates FM transmitter. After a new tube was installed it would run at rated voltage for about a week or so then we would roll the voltage back just until the power started to drop then increase it just a hair. It would stay that way until output dropped at which point we would increase it enough to restore full output. WE would see much better life that simply leaving it at rated voltage from the start.
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