Thanks Alex! So far, I love this amp; it sounds different than anything else I've owned.
Mine has maybe 4 hours on it, only, and it sounds so clean and clear, and powerful (already) with just the stock GE 6AS7GA and stock 12AU7 (no markings - don't even know what kind it is) that I don't know why I'd add the speedball (which I bought) or change tubes . . .
This is really a great design!