Quote:
Originally Posted by old_coot88
It sure looks like a huge power supply ripple. The bars not rolling would be the case if the B&K's vert sweep is locked to the powerline (whereas a TV station's vert is offset slightly, which would cause the bars to roll). Possibly one of the replacement filters has gone open.
If you've got an extra 'lytic cap of equivalent rating as the main filters, you can jumper each one and see if the ripple disappears.
Or alternately if you have an analog AC voltmeter, you can measure ripple. Just put a cap of .1mf or so in series with the meter's hot lead (to block the DC component). I'm not sure i would trust a digital meter in that application.
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I did try adding a cap to each of the electrolytics except for the 1,000mfd cap as I do not have a replacement for it.
How would I measure ripple with an analog meter? I have an analog VTVM and a .1mfd cap. That is to say what would I look for?