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Oscilloscope repair

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jrz126

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I got that mini oscilloscope to turn on, turns out it was the power switch that was malfunctioning. it gives a really sharp looking trace, so I dont think the tube is bad. but I did notice that the trace tends to float up and down 1 or 2 squares (I was inputting a 1khz sine wave at 1V peak to peak. and without making any adjustments, it just started shifting up and down. Does this sound like something is seriously wrong? The manual gives all sorts of information on recalibrating the unit, but I didnt have time to really look through all of it.
 
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