Is it not headphone amp. 

Amp Musical paradise MP428 300B v2 Speakers Klipsch Forté 98db.    http://www.musicalparadise.ca/store/index.php?route=product/product&product_id=53

I bought a new amp. I want to listen to music, musical and clear. What do you suggest me to upgrade the following lamps with the brand and model? I would appreciate if you can help me.   300B x 2, 6J8P x 2, 6AC7 x 2, 5Z3P x 1