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In page UNIVAC I:

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Furthermore, it took approximately 30 minutes to turn on the computer—all cathode heater power was stepped up gradually in order to reduce the in-rush current the concominant thermal stress on the tubes. As a result of these measures, uptimes (MTBF) of many days to weeks were eventually obtained on the processor. (The UNISERVO did not have vacuum columns but rather springs and strings to buffer the tape from the reels to the capstan. These mechanical components then became the most frequent source of failures.)[citation needed]