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A porthole was a line of round screen zeniths from the late 40s to early 50s that had a mask around the picture tube that looked like the porthole of a ship. They are getting more rare by the day and are desirable if working properly.
The crusty flyback refers to what happens to the high voltage flyback transformer after years and years. The insulation coating covering the exposed windings has dried up and flaked off, leaving a crusty appearance. Leaving the windings exposed can lead to high voltage arcing and corona discharge, so its best to cover them.
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Jordan
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