This was a project I started when I heard that my old friend has an old Italian amplifier called Geloso. First time I powered it on only the hum was remarkable. After some measurements and component changes I succeeded to get it work. The sound is quite nice.

Technical data:

Amplifier: Geloso G.211-A, Made in Italy 1959 ?
Power: ~10W
Controls: VOL,  TREBLE ("ALTI"), BASS ("BASSI")
Inputs: 1 input
Outputs: Several combinations
Tubes: 1 x 12AT7, 2 x 12AX7, 2 x 6V6
Rectifier: 5Y3
Schematics: Geloso G.211-A
Geloso story: GelosoStory