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Hi!
This is a power amplifier with a built in simple audion AM radio which was built 1946 in Germany. It has inputs for microphone and pick up with different sensitivities. The notes on the small paper sheet mean that the AL 5 outputtube distorted and was replaced. A electrolytic capacitor was replaced too.
Here are some further translations:
Ein=on
Aus=off
Abstimmung=tuning
Tonblende=tone control
Lautstärke=volume
Rückkopplung=Feedback optimization
Tonarm=pick up
Sicherung=fuse
Greetings Josef
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