About HA5000 Design

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Headphone Amp HA5000 design

Hi guys,

Recently I am doing a AudioTechnica AT-HA5000 simulation.
I got some problems, the THD is a bit high, and several transistor are not available. So I use IRF9240/240 to replace K2955/J554.

Can anyone tell me which MOSFETs can be used to replace them perfectly?

I now use IRFZ24/IRF9Z32, and here's the chart
please help me revise the circuits, thanks.:)
HA5000.png

thanks!
 
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