Clipperton

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clipperton original filament and relay

 

 

 

 

 

The Clipperton originally feeds the cathode from one side of the filament transformer at wire C. This causes hum in the signal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Modified filament

 

 

 

 

 

 

Remove the relay wire to point C and rewire to either of the circuits shown below: