My 508 is driving my Acoustic Zen Crescendos beautifully and all of my tubes are upgraded; Psvane 805, Tungsol 6SU7, 5-6 pairs of vintage 6SN7s, Princess Mesh Plates 300B and Synergistic Research Black fuse which fantastic by it self...
Wig
Wig
Line magnetic 508 with Tekton Double Impacts. Match Up