4R load results are good but not as good as 8R.
Even though THD+N is way better that of the datasheet, I am still far from achieving the level of performance of the Modulus line of amplifiers.
Note how 2nd harmonics is dominant in all of the measurements.
Looks like VAS stage is running out of juice (distorting) earlier then output devices.
By using four LM3886s output stage is equivalent to four pairs of output transistors or 2EF-4.
Even though THD+N is way better that of the datasheet, I am still far from achieving the level of performance of the Modulus line of amplifiers.
Note how 2nd harmonics is dominant in all of the measurements.
Looks like VAS stage is running out of juice (distorting) earlier then output devices.
By using four LM3886s output stage is equivalent to four pairs of output transistors or 2EF-4.