H. De F. Harold

The pioneer of the amplifier.

For example his patent US1349252, just an input transformer an electron tube, an output transformer and no resistors or capacitors, just 3 batteries for filament, bias, plate supply. 

 https://en.wikipedia.org/wiki/Harold_D._Arnold

Asian Spice Restaurant in 86 Liossion street Athens

 At your risk.

I had yesterday one of the best meals i ever had.