If a Vibroplex is used daily and well-maintained, what is its lifespan? Does wear-and-tear eventually render it useless? Does anyone have an original from 1905 that is still operational? 73, Jeff KH6O -- KH6O / B 28.2338 MHz IARU coordinated worldwide 10 meter radio beacon Grid Square: DM04rr 5/8 wavelength vertical antenna 20 Watts ERP