I replaced my recently broken A string Zyex by an Helicore and I don't like it
I've been using a whole Zyex set for almost the past year, and a few days ago I replaced my recently broken A string Zyex by same manufacturer's D'Addario Helicore, which I was told by the vendor that were a level higher than the Zyex.
I thought Zyex were a little better than Helicore, but whatever. Anyways, I've practiced with the new A string and I am not liking it at all, it sounds dull and dead compared specially with the Zyex. I mean, it doesn't sound bad as if it's defective or something, it's simply that it's noticeable worse. Also, supposedly (or for sure), strings are better and sound like no other day the first weeks, so it can only get worse.
Is it normal that I like much more the Zyex?
By the way, I've loved the Zyex all this time.
Can you normally go to the store you bought your strings and change the already opened string you don't like by another one (different model)?
Not all strings are good on all violins, regardless of their level of quality (either the quality of the strings or the quality of the violin).
I heard Helicore is a low-tension string. Maybe your setup is incorrect for a lighter string.
Zyex are high tech composite core strings, while Helicores are steel core strings. There's every reason to expect them to be very different from one another. The Helicores have a less complex sound, which is good for some situations. I'm a little surprised that your shop suggested a Helicore as a substitute for Zyex.
I was suggested this string because of the brand. Zyex and Helicore are both from D'Addario and are non-gut strings, so that's how it happened.
Zyex and Helicore are very different.
Like others, I am surprised they recommended you to put the one string of such different qualities in the set.
Short answer - No, you can't change it.
Sounds like you're supplier BSed you because they were out of stock of Zyex
For folk fiddle styles the steel core Helicore or the all-steel D'Adarrio -NS- Electric are a very good choice, but not for classical players. You will see a lot more Helicore strings in the Cello and Bass sections. I use a Helicore A on my Viola.
"Sounds like you're supplier BSed you because they were out of stock of Zyex"
OK, I'm surprised again, I've been 3 days without practicing. Today I played and the Helicore A string now blends perfectly with the rest of the strings, I like it more or less just as much as the Zyex.
All new strings take time to settle in. The more complex the string structure the longer it probably takes. 4 days isn't unusual.