I have acquired a Yaesu FT-107. I was also given a Yaesu YM-34 desk mic. The FT-107 seems to work fine, except audio out of the Mike seems to be very low and requires having to crank up the mic gain quite high. I have check all the obvious things like the grille over the mic being blocked with crap, but it looks fine. I cleaned the PTT switch contacts... The question I have is can dynamic mike inserts age? Given the mic is probably at least 30 years old. My idea is to replace the dynamic element with an Electret insert, as there's a 5v line on the mic socket for the biasing. Before I do this is there anything else I need to check? Trying to work out how a Mic element would age... Guess it could be the preamp in the FT-107, I need to get another Mic and check it.