TU-75B: Difference between revisions
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m (Revised 3ed paragraph to indicate 3 ballast lights rather than 2 are used, and added the lamp specs per the schematic.) |
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[[File:TU 75B RS5.jpeg|thumb|250px|right]] | [[File:TU 75B RS5.jpeg|thumb|250px|right]] | ||
The '''TU-75B''' is a Variable Line ( | The '''TU-75B''' is a "Variable Line (0–150 V) Power Source Test Unit", a variac combined with a current limiter, primarily used inside of the factory at Test-Final for initial test and eventually to calibrate instruments that came off the assembly floor. | ||
It's a | It's a variac set up for 0–150 V and the E Out/Line switch is for the AC voltmeter. | ||
The 1-2-3 switches provided the choice of up to three internal incandescent lamps (parallel connection) for series resistance when the scope was turned on for the first time to prevent damage from shorts that weren't discovered during a visual inspection. Lamp configuration as specified by Tek is one #1 Photoflood lamp (250 watt) and two #2 Photoflood lamps (500 watts each). When all was deemed to be OK then DIRECT was chosen to eliminate the series resistance. | The 1-2-3 switches provided the choice of up to three internal incandescent lamps (parallel connection) for series resistance when the scope was turned on for the first time to prevent damage from shorts that weren't discovered during a visual inspection. Lamp configuration as specified by Tek is one #1 Photoflood lamp (250 watt) and two #2 Photoflood lamps (500 watts each). When all was deemed to be OK then DIRECT was chosen to eliminate the series resistance. | ||