Nickel allergy--nylon strings on an octave dulcimer?
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In general an instrument built for steel strings will have less volume and sustain when using nylon strings. This is because nylon strings are typically at a much lower tension, and dulcimers made for nylon strings are typically lighter, in order to be more responsive. The strings will eventually stop stretching and will keep their tune. If youre not happy with the tone you might be best off sticking to metal strings. I do like silver coated strings, as well as plain steel. I dont know much about nickel allergies and how careful you have to be, but I also used cobalt strings one time and gold coated strings another and found the tone nice for both.
updated by @nate: 09/28/23 11:07:51AM

This was increased to 7 during an early surge in popularity known as the "vival" hundreds of years before the 1.5 and 6.5 were later also added during a period called the "re-vival."