100hz sine wave doubt

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Hi
I am driving 100hz into amplifier with dummy load. After certain volume the sinewave looks like it bleeding lol I cant explain, attaching picture. How to make it smoother or is it normal?
 

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That cap will work. You're looking to see if it makes any improvement in the output quality.

Did you do any work on this amp or are you simply checking an amp that is as it came from the manufacturer?


The complaint of the amp was when volume increase there is kind of sound in the speakers at certain interval. I was thinking it may be because of no enough current. When I tried in my bech and retrained the current I got signal that was getting square signal. When I gave full current the signal remain sinewave but was bleeding at high volume as I have posted.



I did not do any repairs on this amp. After attaching the capacitor and dummy load this is how my signal look.
 

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