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The smoked driver collector choke L42 generally indicates a surge big enough that the driver transistor did not survive. When the driver quits, it tends to shoot collector voltage out of its base terminal back into the bias pot and bias diode D50. If D50 fails as an open circuit, the new driver transistor will draw enough current to smoke L42, and itself as well, most likely. Never replace a driver or final without being certain the bias diode and trimpot are okay.

73

[QUOTE="nomadradio, post: 756649, member: 22"] The smoked driver collector choke L42 generally indicates a surge big enough that the driver transistor did not survive. When the driver quits, it tends to shoot collector voltage out of its base terminal back into the bias pot and bias diode D50. If D50 fails as an open circuit, the new driver transistor will draw enough current to smoke L42, and itself as well, most likely. Never replace a driver or final without being certain the bias diode and trimpot are okay. 73 [/QUOTE]

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