Quote:
Originally Posted by ChrisW6ATV
It only mentions vertical adjustments, not horizontal, so I am guessing that it does some fun shenanigans with the (AC) filament "signal" to put horizontal bars into the cathode or grid of the CRT.
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I'm guessing that it contains a simple 2 transistor multivibrator circuit, producing a 300-400 Hz square wave that is injected into the grid/cathode circuit of the CRT, to produce evenly spaced black bars on the screen... Any other guesses?
jr