Most transparent amp you've heard?

I'm in complete agreement with Mike. I've owned Placette products and they definitely qualify. No tube preamp I've ever owned qualifies, though there may be some out there, but that's not to say they don't have a lot of other things to recommend them.

Parasound Halo JC1s .. most transparent amps I have listened

Tvad- Maybe you've missed the fact that I'm a Sound Technician, have a number of recordings (done personally) for reference, and have spent the last 30 years training my ears to recognize certain musical nuances to facilitate the proper(natural) set up of sound systems and venues? Then there is what the TacT system accomplishes. Forget it though- If I have to explain, you wouldn't understand!

Mikelavigne's definition of "transparency" is as clear as any I've ever heard. The Placette Passive Linestage I owned at one time was the most transparent piece I'd ever encountered as well.

I think my choices are my current Viva Solista 845 SET and a previous Pass Labs Aleph 3 power amp, for SS