Many thanks for your replies to my topic. Some tenor banjo players have tuned their 4th string (C) an octave up--to my ears a truly great sound for the tenor. I have tried tuning my 4th (C) an octave up--plectrum tuning---that is a 'no-no'---does not work--miss that low C.
When I get around to trying both C's I will post the results. Could be a 'no-no' or OK. 'Gotta give it a try!'
The exact sound of the 4th string tuned one octave higher on a tenor banjo is the same pitch as the sound of the C note at the 5th fret , 3rd string of a 5 string banjo tuned DGBE or a plectrum banjo tuned CGBD. It should be a light string to produce that rich chord melody sound, in my opinion.
Yes--having a 2 course 4th C string--an octave apart. In my opinion should be a 'richer' sound for both single note and chordal playing. (Though nothing wrong with the 4 strings CGBD.) Will have to have 5 tuning machines on the head stock. When time allows will give that a try. When I get around to doing it I will post my thoughts.