Tube Amp, Preamp upgrades -- what did you do that improved your units?

@knotscott  -- I've been rolling tubes, too, and appreciate the KT66 mention. Want to try that; love the KT77s.

Be forewarned....burn in time for the GL KT66s is pretty long.  Bob Latino had suggested around 100 hours.  I think it took every minute of that.  I was honestly ready to give up on them and put them up for sale.  They were worth the wait.  Love them now.

What rectifier tubes do your quicksilvers use, and what are you planning on spending?

The biggest improvement in my tube system so far has been having a independent dedicated 20 amp circuit installed for my audio and video components. This immediately killed the slight crosstalk/ground noise I was getting in my audio and I listen to TV via cable via sound bar. No interconnect between my audio and video system now. The video/Comcast/interconnects between the preamp was the biggest source of noise. I helped the master electrician run the lines and install the lines as his helper didn't show. I learned a lot and would definitely recommend spending ($250-750 estimate) to have dedicated A/V lines as opposed to expensive Power Conditioner.

@invalid 

i believe the qs line stage is solid state rectified