Quote:
Originally Posted by Rudy4
I have a pretty nice carved top F hole mandolin, spruce top and figured maple back / sides that I made and have been playing for something like 20 years.
It's the only instrument that I have that reliably shifts pitch upward when it is set aside in its bag for a month or two.
I attribute it to the carved solid spruce top. ….
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For what it’s worth, the mandolin I experienced this with today is a National resonator mandolin, so it doesn’t have a spruce top, carved or otherwise.
whm