I will just do SPICE simulations. Will be no building 🙂
Pass F4 is an intriguing amplifier. Can be called a high current power buffer.
To begin with I will be focusing on the original F4 as can be seen in service manual.
I know there are some modified versions, but they have their own life.
The original version can be seen in my image.
I have stripped off the JFET input stage, because most preamplifiers have no problem with F4 input impedance.
Some facts I have found out:
Gain: 0.97
Input impedance: ~8 kOhm
Distortion THD:
01 W: 0.003%
02 W: 0.004%
04 W: 0.007%
10 W: 0.013%
20 W: 0.028%
Pass F4 is an intriguing amplifier. Can be called a high current power buffer.
To begin with I will be focusing on the original F4 as can be seen in service manual.
I know there are some modified versions, but they have their own life.
The original version can be seen in my image.
I have stripped off the JFET input stage, because most preamplifiers have no problem with F4 input impedance.
Some facts I have found out:
Gain: 0.97
Input impedance: ~8 kOhm
Distortion THD:
01 W: 0.003%
02 W: 0.004%
04 W: 0.007%
10 W: 0.013%
20 W: 0.028%
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