Thank you too for the schematic.
No probs earckens,
I used the 723 a lot in the past. It was a revolution when it first came out and was pretty expensive too.
I would just use the Eagle schematic of post #12 from now on to avoid confusion. The schematic is drawn with data flow principals, voltage cascading, and minimum cockle which makes the schematic easier to modify and comprehend, not that you didn't do a lot of hard work transposing from printed circuit to sketch (known as cartoon by draftsmen).
Please note that I have not calculated the values shown on the schematic of post #12 and have only transposed the values and interpreted the circuit from your sketch.
I do not fully understand your statement in line 2: "..minimum output current would be 20mA worst case.."
and "..negated embodying a negative current sink.".
This is a classic problem with power supplies. If you take the LM78xx series of three terminal regulators for example, the minimum output load current is 10mA. If you take less than 10mA the output voltage is liable to rise to the input voltage and there will be no regulation.
The reason for this is that the pass elements have a leakage current, which for the 2N3055 can be 5mA. So if you had four 2N3055 transistors in parallel the total leakage current could be 4 * 5mA = 20mA. Note that the 2N3055 specification says that the leakage current could be as high as 5mA at a junction temperature of 25 deg C. In fact, for any individual 2N3055, the leakage current could be a lot less. But the leakage current increases with junction temperature and the junction temperature of the 2N3055 transistors in your power supply is liable to be near the maximum allowable of 200 Deg C when the power supply is outputting a low voltage and 3A.
The way to negate the leakage current is to generate a simple negative supply line, from the existing mains transformer of -5V say and have a constant current generator sinking 30mA say, down to the -5V line. The brings other advantages too: better frequency stability and better voltage regulation at low output currents.
Also line 4: "..no decoupling."?
A schematic is an illusion. It does not represent the real world. Even a short piece of wire or printed circuit trace is composed of resistors, inductors, and capacitors.
The net result of this is that a circuit can oscillate or the components will not perform to specification. This is especially the case for high gain circuits, high frequency circuits, and precision circuits. For example, the average operational amplifier (opamp) has a voltage gain around one million and the 723 contains an opamp.
To negate the effect of parasitics (unwanted circuit components and couplings) you add decoupling capacitors and isolating resistors and inductors and also optimize the layout for maximum performance. That is why on a production equipment you often find all sorts of odd components splattered all over the place.
The theory of decoupling etc is quite complex but there are rules of thumb that can be used. I will modify the schematic of post #12 to show suggested decoupling.
spec