Power Supply Design and Blocking

[ArtG]

From reading material concerning "blocking" phenomena, I find that one area of concern is power supply stability. Specifically, that when the output stage clips, it draws down the B+ voltage, which has the detrimental effect of doing the same to the voltage amplifier and phase splitter stages, in many cases.

In a power amplifier that I'm constructing, I've created a simple BJT pass regulator, fed from the input capacitor to supply the voltage amp/phase splitter, thinking, among other benefits, that would isolate the voltage amp from the output stage to some degee. However in adding a "reversed" protective diode around the pass device, I notice that this diode gives a direct path to input cap, allowing it to possibly draw from the voltage amp, and the regulator output capacitor, under conditions noted above.

My thoughts to improve this would simply be to add a diode at the regulator output, blocking reverse current flow, and, I think, eliminating the need for a protective diode, wired around the pass device.
I don't recall ever seeing this done, however, and I'm wondering if this could create problems that aren't apparent to me! (The .7V drop would be of no consequence in this circuit.)

Anyone ever do this, or have thoughts about this?

[SY]

Regulation is an excellent approach. A diode in series with the output is not a good idea, adding an unnecessary and nonlinear series impedance.

If your supply is being dragged down fast enough and hard enough for the output diode to provide a discharge path from the output cap into the raw supply, the voltage drop at the input stage is the least of your worries.

[ArtG]

SY,
I'll just forget the diode, then, and go ahead without it, as originally planned. I think you are right. To draw down the input cap by 50 volts, or so, the output stage would be "really cooking", among other things!
Thank-you for the reply!