preamp high voltage on base of differential par transistors

hello, I would be very happy if someone could explain why it is 2.36V on the based off the transistors.

i have measure voltage on all the mos-fet and transistors and printed it out in the pictures.
 

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  • technics_su-c2000_sm_1.pdf
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  • L-channel voltage.png
    L-channel voltage.png
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  • R-channel voltage.png
    R-channel voltage.png
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  • technics_su-c2000_stereo_control_amplifier.jpg
    technics_su-c2000_stereo_control_amplifier.jpg
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