Last sunday I placed goldmund cones under the jadis convertor, proved to be a good choice.
Also replaced the dedicated lines with AHP fuses,
first impression : wider image/air, more laid-back.
link : http://www.degroefaudio.nl/dg_audiophile.php?vNr=1
forsell with jadis works very well, like analog.
i relative has also a forsell with the original dac, he has tried the jadis, he said it was better.
In the past i was using stax dma x2 as amplifier with the avalon's, very good, but with tubes you will get the magic.