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A factory modification, MOD 108A, was available for increasing the CRT acceleration voltage from 10 kV to 12 kV. This improved trace visibility at high sweep rates. | A factory modification, MOD 108A, was available for increasing the CRT acceleration voltage from 10 kV to 12 kV. This improved trace visibility at high sweep rates. | ||
Early 551 units used [[ | Early 551 units used [[UHF connector]]s. Many were converted in the field to use [[BNC connector]]s. | ||
==Specifications== | ==Specifications== |