Tube amplifier explained

I found these two videos really awesome in explaining how a tube operational amplifier works.

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Geloso G3227-a vacuum tube amp, revive project

In the '80s a hospital in Den Helder, built in the '60, was renovated and one of the guys working at that renovation found, removed and took home this amplifier that i bought after almost 40 years. The amplifier was used for announcements on the microphone to be sent to all the speakers in the hospital.
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