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The selectivity of the RF stage was almost always good enough to deal with lots of channels. Some sets would overload, but if input levels were kept within normal range, there wasn't usually a problem. Early transistorized sets did sometimes have difficulties with lots of channels, and were more of a problem than early tube type sets.
Many cable systems had difficulty keeping levels constant, and often had significant "slope", with lower channels much stronger than upper ones. This often caused problems.
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