37 Sectionalizing Trouble

3-8. AMPLIFICATION SYSTEM TROUBLES.

3-9. Such troubles as loss of volume, poor quality, excessive hum, noisy operation, or no signal are usually traceable to the amplification system. For example, if distortion is noted in the loud speakers, connect a headset across terminals marked "G" "G" on the console preamplifier. (See figure 1-7.) If the quality is good on the headset, the cause of the distortion will be found in the amplification system following the console preamplifier. Should distortion occur at the preamplifier terminals, replace all tubes. Should distortion in the console preamplifier continue, test each preamplifier stage individually with the headset. When the defective stage is located, test each capacitor and resistor for deterioration.

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