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Not an engineer NOR a tech; but that red line is the 8v supply rail that feeds the bias circuit down at the left end of the red line. The bias is controlled by the diode which regulates the bias to AB thru the driver or final heat - affecting that changes the bias diode voltage flow. You don't see that regulation in a Cobra 29 driver or final. That is the way I understand it; please correct me if I am wrong.

[QUOTE="Robb, post: 566421, member: 8446"] Not an engineer NOR a tech; but that red line is the 8v supply rail that feeds the bias circuit down at the left end of the red line. The bias is controlled by the diode which regulates the bias to AB thru the driver or final heat - affecting that changes the bias diode voltage flow. You don't see that regulation in a Cobra 29 driver or final. That is the way I understand it; please correct me if I am wrong. [/QUOTE]

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