If the OP had started with a Luman SS Pre and wanted to go something to soften the highs, I'd completely agree, go tubes.
However, the OP is starting with an Oppo HA-1 which, IMHO, is awful. If he can listen to that, then going to the Luxman will be a huge improvement across the board.
He _should_ listen.
Also, yeah, I have problems with the Triangle horn tweets, but I wonder now how much of that is placement. Don't toe those in, and make sure you have lots of high frequency absorbers around the room, especially between and behind the speakers, including the floor.
However, the OP is starting with an Oppo HA-1 which, IMHO, is awful. If he can listen to that, then going to the Luxman will be a huge improvement across the board.
He _should_ listen.
Also, yeah, I have problems with the Triangle horn tweets, but I wonder now how much of that is placement. Don't toe those in, and make sure you have lots of high frequency absorbers around the room, especially between and behind the speakers, including the floor.