The 8ohm taps were clearly better, and had a hard time understanding why based on the impedance graph. There is another audiogon forum discussing this where someone else mentions the Olympica III runs better on 8ohm taps for them too. It was interesting, because the Primaluna taps were, 4, 8, 16. But the VAC 200 iQ (and probably other VACs) have ranges for their ohm taps: 1-2, 2-4, 4-8. This may explain better why the VAC runs the Sonus Fabers better, since there is a broad range where the ohms are constantly changing. Maybe the VAC is better at handling this? Not sure. All I know if the 4-8 ohm taps (and the 8 on the Primaluna) were clearly better. Judge by your ears in the final analysis.
Nightfall, the Preamp I have been saving for. Initially was the Primaluna preamp, but would eventually love to upgrade to one of the following (again a tube guy): Zesto Leto, EAR Yoshino 868 or 912, Herron Audio, or VAC. I think VAC is coming out with a more affordable preamp this year.... at least that was the rumor a while ago.
Nightfall, the Preamp I have been saving for. Initially was the Primaluna preamp, but would eventually love to upgrade to one of the following (again a tube guy): Zesto Leto, EAR Yoshino 868 or 912, Herron Audio, or VAC. I think VAC is coming out with a more affordable preamp this year.... at least that was the rumor a while ago.