As requested, here is the more detail info about (US$41,000) Heracles tube mono power amps… “Heracles” is the newly invented Knight Stereophonics flagship model. This Mono Power Amplifier provides ~125W RMS output power (16Ohm).
The Vacuum Tubes in each unit are 5R4 x 2, 6SN7 x 2, 6L6 x 2, 212 x 2. Each Mono unit weighted ~63kgs.
The listed price of a pair of Heracles Mono Power Amplifier is US$41,000.