audio was good on both am and ssb with the resistors cut with a turner +2 mic and a cobra xl350 through an old super magnum 1/2 wave. I adjusted the mic gain on am and ssb by listening on headphones through a 148 with rf gain down and no antenna. Both seemed clear with am liking more mic gain. So if I plan on running power, does r131 need to be intact or is this an acceptable mod to leave alone?