80 seems to be a mixed bag these days.. One day you can hear the world.. the next you can not (hardly) hear yourself.
Wish I could find the source of some of those noise generators that sweep very slowly across the bands and send a friend of mine to visit them with a couple of containers of stuff he had in his lab.
I'm not sure what was in those containers.. I just know you mix the two and RUN LIKE BLAZES before they have time to react.