While you can certainly enjoy HD800S with a SS amp they scale better with tubes and you are rewarded with a better soundstage. The only SS amp I have heard I could use long term with the HD800S is the Eddie Current Black Widow (discontinued now.) The usual recommendation for a budget amp for HD800S is Vali 2 and save your money for a great tube amp. Have not heard Lyr 3 yet though. Vali 2 with an Amperex 6DJ8 is great value for under $300 but you have to replace that stock tube.