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RE: This circuit appears capable of that voltage swing.

Hi Ralph,

My question actually is on 5687 voltage amplify stage, which has 1K unbypassed in cathode What is the main purpose for the designer to insert 1K ohm unbypassed in this stage. Distortion reduction?

In not allowing loop NFB, I always find a simple RC voltage amplify stage necessarily swinging around 140V P-P, creates certain harsh sound in mid high, surely it is distortion, so do you think in this example, the 1K would have significant distortion reduction result?

apart from adding a resistor in cathode, what other approach would you use to reduce the harsh high, if no loop NFB allowed

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