Re: Irish tenor banjo - Open back or Resonator?
If you're just participating in seisuns, I'd stick with an open-back, which doesn't project as strongly. Banjos are loud (news flash!!), and if you want to blend in with other instruments and not dominate, you don't want to be as loud as you can get.
As to neck/scale lengths; in my experience, the main difference is, if you're mostly playing single-note fiddle-tune melodies out of first position, the shorter scale and more closely-spaced frets of a 17-fret make this easier. I don't think that either type of banjo has a preference as to sound -- at least not one that can't be modified by string selection, head type and tension, etc.
And no, there are no "Irish tenor banjos"; there are tenor banjos that are put into GDAE "Irish" tuning, or some variant thereof. The shorter-scale 17-fret instruments were made before 19-fret necks were made popular (actually, Gibson had an early 18-fret instrument, I believe), and later 17-fret ones were sold as "student" models (perhaps for kids' smaller hands?). Now companies are building 17-fret models and marketing them for Celtic playing, but obviously you can play Celtic music on either type.
I have an old 17-fret Bacon Orchestra model, and I do like the shorter scale, coming from mandolin-family instruments. Nothing to stop someone from getting a 19-fret one and capoing it up a couple of frets, though, if the longer scale's a problem.
Allen Hopkins
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