No no, I did read it well...

I just wanted to confirm the same results by calculating it again myself.

(active learning as opposed to passive)
Well, thank you very much (puno ti hvala!!

), you've helped me gain a lot of new knowledge.

Now that calculations are behind me, I can finally draw the new schematic:

The final thing I now must do, is to draw and etch a PCB

(I'm tired of perfboard)
Well, while I'm at it...

I have an enclosure measuring L/H/D = 12 x 4 x 18 cm.
I would like to mount the preamp in this enclosure, together with the power supply.
Power supply would be a simple one, small 15V trafo, around 1000uF smoothing, LM7818 regulator.
I think this would be ok:

Would the close proximity of transformer create any serious noise in the preamp?
Distance between the transformer and preamp PCB would be around 10cm

I could always use a separate power supply, but I would like to have a single practical unit, that works by itself
