At your risk. Take all necessary safety precautions to protect everyone and everything involved.
This is it:
https://www.radiomuseum.org/tubes/tube_df650.html
It looks so similar to hearing aid, mic amp and so many other world class electron tube circuits that initially it was thought it is a hearing aid circuit.
https://www.radiomuseum.org/tubes/tube_df651.html
How would it sound driving with speed reel to reel or cassettes recording heads?
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