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Old 13th Sep 2020, 5:16 pm   #6
Herald1360
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Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 15,256
Default Re: Antique loop aerial, mains powered

Quote:
Originally Posted by rambo1152 View Post
Interesting.....

It's a tuned amplifier, not a broadband one. The mysterious box in the circuit contains a selector switch and some coils and a capacitor (at least that's what's visible) for LW,MW and SW.

The circuit is clearly for a later model since it shows an EF80 with different resistor values from the unit in the pictures which uses an EF42.

Attached is "English style" version of circuit.

Assuming that the actual loop is a simple single turn of chromed tube it would make an interesting DiY project.
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