[time-nuts] 60kHz Loop antenna

[Arthur Dent]

John-…”HP's loop for the 117A is not tuned, as I rember, but it
is followed with a narrow band amp.“

Both the nuvistor and FET versions of the loop show capacitors across the loop winding to tune it. 
http://www.leapsecond.com/museum/10509a/

             -Arthur