Quicksilver silver 60 amplifiers

There's one on sale at USAM right now.

I’ve owned my V4s since 2011.  They can run almost any power tube between EL34 to KT150s.  Manual bias setting as easy as “Sunday morning”.  Electrostatics, planars, box speakers , have run them all over the years and never disappointed. Many speakers have come and gone, these amps have stayed.  Never been in for service, runs power tubes conservatively and the guy behind the company is Mike Sanders, super great guy!  Now out of production(when they do show up they sell quickly) but he’s got others , less powerful, but probably as good.  

I would not hesitate if they tick all your boxes and have not been messed with by others.  A call to QS would be where I’d start. Good luck! 

I recently picked up a pair of QS M135 monos- fantastic