build the PRR vari-mu!..
it is a simple build with a verified layout and it sounds just great...
since you are in sweden, BLR (bilradiolagret) has the groundloop transformers PRR suggests, LH-musik has the tubes and sockets, kjell&co has PCB blanks and etch sollution and if there is anything else needed, elfa has "everything from antenna to ground"
..only thing other than that, look at gyraf G9 for ideas how to get the voltages you need without having to customwind your transformer..
johan