G.G. (Italy):
The Sound Grail: Valve Amplifier (Non Polar Technology)
G.G. (Italy):
The Sound Grail SET Tube Amplifier schematic
G.G. (Italy):
SET NP ultrapath with cathode bypass loop
G.G. (Italy):
The Sound Grail: homemade valve amplifier
G.G. (Italy):
Single Ended Tube Amplifier
G.G. (Italy):
The Sound Grail