Hi Rebbi,
The build quality is high. A mini tank. You will be able to pass this amp on to your grandchildren.
My BlackTreasure 6CA7 tubes finally arrived from Grant Fidelity on Monday. I've been burning them in since then. I can already hear that they are going to be better than the Gold Lion KT77, RFT Simens NOS EL34 and Shuguang EL34B. Will report later as they continue to burn in. In my system the bass has been extremely good, a SET that rocks. Not slow, syrupy. The PRaT has been right on. This is not hyperbole.