[Diabolical Artificer]

Thanks again Dave for the thought and effort your putting into this. Still plugging away at this, got distracted by making a mosfet testing rig. Having to test mosfets as my curve tracer has gone gaga - no step bias.

Re I3 I just divided 376/4mA =94k or 100k, will try something smaller.

A valve based regulator would be easier here however I have space constraints and efficiancy also plays a part. Valve reference's are easily available Ed and look good what with a lot glowing pretty colours, just haven't the space here.

I started down this rabbit hole after the simple fet based "regulator back in post one was found lacking. Several other regulators found on the web and elsewhere were found to be less than perfect, the floating regulator type's suffering from instability.

Found an old schematic Miguel knocked up for me years ago, see attached, this has an extra rapid discharge circuit on it, which could be ommited. Anyhoo, with the ammount of work Dave has put into this I'll get it working.

Andy.