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The resistors needing replacement are most often higher-value ones (perhaps 100,000 ohms and higher) in any circuit, as opposed to those in particular areas. They often go bad by becoming more than 20% higher in resistance than their original value. To some degree, you can test most resistors without disconnecting them, since the value you measure in-circuit would likely never be higher than the resistor value alone. 100K and higher are the yellow multiplier, green multiplier, and blue multiplier ones (the third stripe counting from the end where the stripes start). When I do tests, though, I test every resistor and also have found lower-value ones that have drifted higher.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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