I do not buy that NTE is garbage, I have proof, I used TO-220 drivers in my Pioneer SX-950 20 years ago and they are still fine. but NTE parts should be used as a last resort since there are usually many cheaper/better options. for the jfet match Idss is one of the most important spec's in order to match a jfet. Pinchoff voltage is another. Since this application is basically DC abs max voltages and power dissipation are things to match. If you look at many Sansui high end gear, they used a simple bjt/diode/resistors as a constant current source for this linear regulator supply startup application.. Echowars led/bjt CCS is another option.