DH-120_voltage.txt

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DH-120 Adjustments for Bias and Balance procedure ...

DH-120 Adjustments for Bias and Balance procedure Adjustments for Bias and Balance These two potentiometers on each circuit board have been set at the factory, and should not normally require adjustment for the life of the amplifier. The Balance control, which is P2, is to the right when facing the board with the row of connecting eyelets along the bottom. It should not be adjusted without a distortion analyzer, and even then, only with factory advice, since other factors affect distortion as well. If the output or driver transistors are replaced, the Bias control, P1 , may warrant adjustment to achieve the desired 150 mA current. Remove the fuse on the left of the board, below the potentiometer, and connect an ammeter across the fuse clip. Avoid intermittent connections, and do not short the leads together. With the AC line adjusted for its nominal value (120 Volts in the USA), set P1 for 150 mA. Turn the amplifier off, and when the current drops to zero, remove the ammeter and replace the fuse.

DH-120_voltage.txt

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