I think the Van Alstine RB10 (which I have) could be a good pairing for the F7 but the F7 has a 10kΩ input impedance.
If you buy a new one from Frank , he can make an adjustment to one of the preamp outs to be a super low output impedance that will drive the F7 nicely. I think it drops the output impedance from something like 2200Ω to 47Ω.
Preamp for First Watt F7
Wondering if anyone has recommendations for a preamp for the First Watt F7 power amp. Hoping to spend less than $1500, and I'm happy to buy used. My system includes Tannoy Turnberry speakers, Denafrips Pontus Dac, Firstwatt F7. This is for a second system in our bedroom, so I'm not trying to spend a ton.