The junction od D23 and R32 i the point where R33 should be attached, not to ground, the purpose of C19 and R33 is to isolate dc from follower(which is about 150-200VDC) from clipping diodes, so they will survive, and create clipping in the signal. Also I would advise to change C19 to about 220-680nF(at aleast 250VDC rating).