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2A60: Difference between revisions
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The output stage is a differential amplifier formed from both halves of a [[6DJ8]] dual-triode. | The output stage is a differential amplifier formed from both halves of a [[6DJ8]] dual-triode. | ||
To help linearize the output stage when it is making large positive or negative excursions, | To help linearize the output stage when it is making large positive or negative excursions, | ||
a pair of diodes is placed in parallel with the resistor that connects the cathodes of output triodes. | a pair of germanium diodes is placed in parallel with the resistor that connects the cathodes of output triodes. | ||
The effect is that when the signal swings far in either direction, the gain degeneration (negative feedback) | The effect is that when the signal swings far in either direction, the gain degeneration (negative feedback) | ||
is reduced. This helps keep gain stable across the range of signal voltages. | is reduced. This helps keep gain stable across the range of signal voltages. | ||