Simple high voltage regulator suggestions

[zintolo]

Thanks @Ite , I did it with 50mA as @jan.didden suggested.
Results fit what has been written above.

 

[jackinnj]

By using the formula you gave me on the first reply to the topic:

You set the source voltage to DC, set the current load to AC=1, with DC current at 50mA. Analysis mode = AC, 100 points per octave, 10 to 10MHz. Then the vertical axis in Ohms will be V(out) as the denominator is "1"

Change the right vertical axis to "Group Delay" and you can easily calculate stability. Here's an LM317 example to demonstrate stability under various C(out) ESR:

 

[jackinnj]

Here's your circuit. For stability, put a 1 Ohm resistor in series with the output capacitor:

 

[zintolo]

Thank you @jackinnj !
So, considering other capacitors downstream, better to add a small resistor in series with the regulator, so that will be in series with any capacitor connected to the outfeed of the regulator.

 

[Rod Coleman]

If you add 1 ohm in series with the output, the effective output impedance is the same as simply the output MOSFET with its gate connected to the zener stack!

You have to ask yourself - what does adding the error amplifier help you with, in exchange for its trouble? That's even before you compare the sound.

 

[jackinnj]

Rod makes a very good point -- the error amplifier (in this case a single depletion MOSFET) -- may distort, putting harmonics of the fundamental onto the power supply rails. If the amplifier PSRR itself is "weak" you're going to hear the signal "smudged".

I have demonstrated this with Erno Borbely's excellent all jfet preamplifier which has only 40dB of PSRR. You can hear the effects of different voltage regulators on the sound, and it doesn't take "golden ears" to witness the effect. The knowledge of this effect arises from a kind letter written by a DIYAUDIO member to the editor of Linear Audio and not original to me!
.
My advice it's not going to cost you a lot to hear various power supply schemes. Try listening to them with recorded piano music, male voice, and a lot of percussive instruments.