For the sound quality the audio power amplifiers must output sine wave when open loop and 4Vp-p input , I have testing the +_70V and +_85V AMP drivers , Open loop X27/X3=9 is better sound and more detail like tube AMP, It' is 3W only.
+_70 Driver open loop Vcc2 is not enough :
+_85V driver Open loop X27/X3=9 is better
1KHZ:
20Khz:
100KHZ:
Now the transistors AMP and the tube AMP are the same sound quality, and the transistors amplifiers can out put 1HZ to 20Hz audio signal.
And the Vcc1 are regulated when Vcc1*Ic(2SC5200/2SA1943)>=(Max output voltage)*(Max output voltage)/8 Ohm(Speaker impedance) , This is new rule that I tested.
+_70 Driver open loop Vcc2 is not enough :
+_85V driver Open loop X27/X3=9 is better
1KHZ:
20Khz:
100KHZ:
Now the transistors AMP and the tube AMP are the same sound quality, and the transistors amplifiers can out put 1HZ to 20Hz audio signal.
And the Vcc1 are regulated when Vcc1*Ic(2SC5200/2SA1943)>=(Max output voltage)*(Max output voltage)/8 Ohm(Speaker impedance) , This is new rule that I tested.
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