Do preamps have a material affect on high level sources?

@georgehifi 
 No surprise that a preamplifier OEM would respond with that rubbish. Pints for the house!!  I will miss the pretty tube glow however.

BTW my interconnect cable is 55 pf per METER, not so hard to overcome even when running 5 ft to mono blocks.

Yes that's fine, good quality ones are lower than 100pF foot.
  
Only if you've crap interconnects with high capacitance and over 4mt, does so called "driving the cable" become an issue As I said it's something manufacturers of active preamps have hung onto just to do scaremongering tactics with. 

I went passive a year ago ( Luminous Audio Axiom II, Walker Mod, 3 in, 2 out, single ended ), and never looked back. Enjoy ! MrD.

"...thought up by active preamp makers to aid in their product sales."

Funny to hear this from someone who floods these threads constantly pushing his own passive preamps. Just stick with technical inputs and leave out the editorials.