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Ceramic caps are fine for RF bypass duty, you see them in tuners, IF strips and sound IFs. They rarely go bad, so you shouldn't need to replace those. You usually avoid using ceramic caps in any tuned circuit (though some specially made ceramic caps, made to not drift much over temperature, are found in RF circuits, they are usually 5 to 100pF range). And avoid using ceramic caps in RC oscillators, like vertical osc circuits. Or horizontal oscilators, where the cap is part of the timing circuit.
Audiophiles avoid ceramic caps in audio amplifiers for hifi work, but if the amp in question is the usual 1 watt tube driving a 4 inch speaker in the side of the TV cabinet, ceramics will work well enough
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