I did own one of Don’s preamps and it was very good. I sold it when I went to an Allnic integrated amp. When I decided to go back to separates I thought I’d try the Hattor and I’m glad I did, it’s a great pre. I’ve owned many active and passive line stages and I always come back to passive because I favor high sensitivity speakers and tube amps, which is where they shine. I honestly think if your system is passive friendly, there aren’t many actives that can sound better. Again, that’s my opinion.
Ive owned them all. TVC, AVC, LDR and resistor passives. All are good and will beat most actives in the right circumstances.