i had a chance to do some further investigating having both the 76 and 77 in the same room hooked up to the same amp. even went as far as swapping the harps to see if i could hear a difference in the tines or pickups.
interestingly, i narrowed the difference down to the worn out hammers on the 76!. the rubber must be more dried out causing a bit more of a percussive effect, also the fact that they have grooves in the rubber might affect it a bit. maybe increasing the surface area of the strike.
anyway, its all in the hammer tips. not the pickups, tines, or anything else.
interestingly, i narrowed the difference down to the worn out hammers on the 76!. the rubber must be more dried out causing a bit more of a percussive effect, also the fact that they have grooves in the rubber might affect it a bit. maybe increasing the surface area of the strike.
anyway, its all in the hammer tips. not the pickups, tines, or anything else.