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Advantages - very cheap, and easy to replace. Since they fail open circuit, a small low value resistor can be used instead of a more expensive fuse.
Disadvantage = waste power, by turning it to heat. If you follow the link below and study the circuit diagram you will see that current is flowing in both Rb1 and Rb2 even when there is no signal being amplified. That "quiescent current" is wasted because it is not achieving anything and power is consumed through the production of heat.
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