well, not to go against the tide here, but I was underwhelmed by the Placette Passive- and this was in a system with Wyetech Topaz Monoblocks. It was clean and clear, however for me anyway, lacked the harmonic texture and body I have heard in other preamps, in particular the Melody 1688, which in that same system was an eminently more musical preamplifying device.
The above being said, I do think Teajay is on to something, as I have found the TVC-based passives to exhibit more body than the resistor-based. I was particularily impressed with the Audiosector S&B TX 102-based Pre-T1 passive preamp- superb in every way, however, only missing what I term as the 'x' factor or that certain magic a great active tube preamp brings to the table.