Closing the opera, Persson's Liebestod delivered the ultimate Wagnerian transcendence.
Runi Brattaberg, as King Marke, combined sympathy and authority, gloriously voiced, in his second act monologue.
Daveda Karanas made a real character of Brangane, tied by destiny to the fate of her mistress, while Bo Skovhus' Kurwenal was at his most moving in the final act, bonding with his dying friend.
Smaller roles, including Marco Stella as a malevolent Melot, were well delivered and the men of the Chapman Tripp Chorus were a lusty, vocally resplendent crew of sailors.
Cynics have jested that singers are the icing on Wagner's rich orchestral cake, as all the drama is signposted in the instrumental underlay.
The APO more than lived up to its responsibilities here. If the opening Prelude had a few nervous twitches, three hours later, the third act opened with soul-gripping intensity.
Marke was hailed with spectacular effect, yet there was much exquisite solo work, most visible when Martin Lee played his melancholy cor anglais from the choir stalls.
As if Tristan und Isolde were not enough of an achievement, the APO returns on Thursday with a concert featuring another important opera, Berg's Wozzeck - a cheering sign that this orchestra is determined that Aucklanders get the very best music possible.
Music
What: Tristan und Isolde
Where: Auckland Town Hall
When: Saturday.