After switching to DC heaters in my 300B SET I preferred the Jensen/Audio Note/Angela (?) paper-in-oil caps. I found AuriCap and Multicap RTX too dry and Vitamin-Q and Russian oilers too slow and muddy (but with killer mids). The AN's just seemed to be the best compromise in that circuit.In my AC heater 45 SET I love the Jupiter caps, might be the best of the bunch but I never bothered to swap them out to compare, I just like it the way it is.