Originally Posted by robm321
Agreed - make sure the preamp has a tube signature if you get the F1 which can sound a bit analytical compared to the Aleph. But the F1 with some pre amp warmth might just be the ticket and gives the most bass I've heard with the K-1000s.
I was lucky to get an Aleph clone for $400 on audiogon, no lack of bass other than the usual K-1000 roll off which no amp can fix.
There is definitely a difference between the Aleph series and the F1, and having owned both, I would say that the Aleph has a more "tubey" sound, which was what Nelson Pass intended, but the sound was a little bit fuzzier and rounder than I would've liked, and the F1 just controls the bass so much better.
And the F1 is more transparent and revealing of upstream gear, if that is important to you. I've heard the GS-X and the Zana Deux as the pre-amp for the F1, and each combination sounded different, which leads me to believe that the F1 imposes very little signature of its own.
I personally like the clarity, detail, and bass control provided by a top-notch SS amp, but the F1/K1000 combo is transparent enough that you can tweak the sound with source and/or pre-amp. This is why I haven't heard two F1/K1000 system that sounds the same yet.