You should also confirm the max voltage rating of say a 10x probe - it may not be above 600V, so I'd be keeping it well clear of output stage anodes, and some power supply rails on larger amps.
A poor mans oscilloscope can be to use your soundcard and a suitable capacitor coupled voltage divider - many articles on that. I use one with TrueRTA for all my amp setup and faultfinding - the spectrum analyser function is awesome for appreciating mains hum characteristics and harmonic distortion levels. But it is still about voltage ratings of the parts, and some judicious clipping - even better if you have an old or cheap sound card.
A poor mans oscilloscope can be to use your soundcard and a suitable capacitor coupled voltage divider - many articles on that. I use one with TrueRTA for all my amp setup and faultfinding - the spectrum analyser function is awesome for appreciating mains hum characteristics and harmonic distortion levels. But it is still about voltage ratings of the parts, and some judicious clipping - even better if you have an old or cheap sound card.
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