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An old amplifier
FET amplifier model
Hybrid valve-FET amp

A FET amplifier model


Last addition:

I discovered an error in this schematic: the JFETs here are 2SJ104, but they must be 2SJ103. 2SJ104 can't work with such high voltage. But 2SJ103 have much lesser forward transconductance and the resulting THD level is much worse.

Recently I've designed a much better schematics, but I wouldn't like to publish it for some time. It is worth to be implemented in hardware. I can only show the modeled distortion levels at 30! kHz. Keep in mind this: the load resistance is 4 Ohms there, and take a look on the signal amplitude.

The schematic:


Frequency response:



Distortions at 1kHz:



Distortions at 20kHz:



Comment this schematic
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