Audio Aero
A French high tech firm Mazeres Aviation of whch Audio Aero is an Audiophile division and creat some spectacular audio gear. This Audio Aero Capitole tube amp uses EL34 and with its TRAC system (Tube Relay Amplification Concept)
Which the company says is "based on a 1950s triode-pentode amplification design" that produces "triode musicality and pentode power." The Capitole uses matched quads of 6550Cs, E34Ls and 6SN7GTs to deliver 50Wpc in class A.

