All FET 3T Headphone Amp with H2 Generator

[lineup]

Nelson Pass has shown how to generate H2 Harmonics.
Can be described as a TUBE like sound.
This amplifier features a H2 generator.
It is U4 in the schematic.

The amplifier itself is an All FET 3 transistor device.
The distortion is quite high, because there is much H2 singing along.
As can be seen in the Fourier Analysis.

 

[lineup]

Here is an improved version.
It uses JFET LSK170.
Still there is a lot H2 harmonics.

I can promise an interesting sound.

 

[Osvaldo de Banfield]

In place of the 334 you can use another JFET (or 2 cascoded) and meke it really all fet.