Indeed! I have now bought NOS tubes (Mullard 12au7 and I snagged a 5998)- those 2 tubes cost 55% of what the entire Crack cost, but I am still all smiles because I know that for under $500 I have a killer amp for my HD600's. I almost pulled the trigger on a Bryston at more than twice the price!
Crack/Speedball, SEX 2.1/C4S, Bryston BHA-1
Sennheiser HD600/Cardas cable, Beyerdynamic T1 2nd Gen, Hifimam HE560/Hifiman balanced cable