The WAVAC 833A SET costs $480,000, and it has less than $2000 in parts to build one yourself. Lundahl coupling transformers and the biggest Hammond SE transformer are more robust than anything you can get with a near half-million-dollar pair of monoblocks. You can also use polypropylene power supply capacitors instead of electrolytic capacitors for better ESR and freedom from the way higher Voltage electrolytics go to hell after a few years of their limited shelf life.
This makes me suspicious of high price audio such as speaker cables costing over $20,000 and are advertised with bad physics such as concern over skin effect that makes less than a hundredth of a decibel difference in frequency response at 20 kHz.

