I want to put new strings on my viola, as the current ones are more than five years old. I think the current ones are D'Addario Helicore for C, G and D, and Jargar medium for A (I tried to lookup the silk colors). These are the strings the builder put on the instrument.
The instrument itself is for students, my technique is not great, and I play for my own pleasure only. So I'm looking for robust, responsive strings that are not too expensive. I'm quite happy with the Helicores, but the A string sounds a bit too bright for my liking. I don't know if that is because of the string or also because of the instrument, but I guess the builder had a reason for using a different A string.
If I replace the A string with a Helicore, will that make the A sound less bright or brighter? What other strings are there that might suit me?
(Added later, in response to comment by Bob Broadley) How does string type (polymer core, steel core, winding, ...) influence the sound and the responsiveness of the string? Are there any general rules of thumb concerning that?