There have been several discussions concerning nylon strings on a tenor. It's been pretty well decided that nylon will break at the proper gauge and tension required to tune to the "A" string of a tenor banjo.
It's conceivable that nylon could work with Celtic tuning, GDAE.
I tried nylon strings on a tenor only for C and G strings (classical guitar srings) because the sound was to bright. It sounded good but the strings were too soft and sliding under my fingers, difficult to control and bad feel. Then I didn't persist.
If you tune Chicago style get a set of Aquila reds or classic banjo strings and use the 4th to 1st string. Tune DGBE.....works great. I play a Vega and a Bacon plectrum. These are the strings I use. You can also use Baritone Ukulele strings.
I tried nylon strings on a CGDA tenor banjo. Two classical guitar strings (wound), a ukulele string, and a length of nylon string from a DIY shop. To avoid A string breakage, I tuned my instrument Bb, F, C, G.
The two classical guitar strings were great, on tenor. The other two not at all. And strumming all four strings sounded really crap.
Edited by - Veerstryngh Thynner on 10/12/2019 03:07:51