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In this video, I show exactly how you can use a cheap Oscilloscope (o-scope) only $40 on Amazon to set the gain on your amplifier like a pro! No need for expensive gear, or to risk it if you are not comfortable with tuning by ear.
Link to O-scope i used is here:
www.amazon.com...
There is also another option a subscriber recommended here that they say also works. it is about $8-$10 cheaper:
www.amazon.com...