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Positive side of sine wave seems elongated

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#21
Since you only have 8 Ohm output taps on each amplifier, then . . .

Get Two 8 Ohm resistors.
Two 8 Ohm resistors in parallel = 4 Ohms
Two 8 Ohm resistors in series = 16 Ohms

Try 5.6Vrms with 8 Ohm load, '3.5k', then '5k' amplifier.
Then change the load on each amplifier to 4 Ohms, then to 16 Ohms.

Next, 8Vrms with 8 Ohm load, '3.5k', then '5k" amplifier.
Then change the load on each amplifier to 4 Ohms, then to 16 Ohms.

You will see the change of the sine wave shape at the output.

Many "8" Ohm loudspeakers impedance will vary from 4 Ohms to 16 Ohms, depending on the frequency.
 
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