Found this for a Wells 19V1001 in an old post...when you say power wave, is the whole picture waving back and forth, or are you getting a roll that goes up the screen?
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The B+ on that monitor should be 75 volts. The adjustment is a pot laying flat on the chassis, on the corner of the circuit board closest to the large silver can capacitor.
The test point is marked #2, according to the manual. I forget exactly where it is.
This monitor uses a multi-section B+ filter cap - it's that silver can. It actually contains four capacitors in one, and can be replaced with four separate capacitors. Just tie all the cap's negative leads together. According to the manual, the sections are:
800uf@125v
200uf@100v
200uf@50v
20uf@200v
These old values are not commonly seen any more. Replacements can safely use slightly larger capacitance values. So you can substitute 820uf for 800uf, 220uf for 200uf, and 22uf for 20uf.
-Ian