What Thomas said, just think what you figure your Snipe is worth, not just the pieces but your investment in time (blood sweat tears) and your love for the aircraft. Get a new radio, either one of theirs that wont have this problem or some other Mfr. Id retire all Xmitters of that type TODAY. Never to be used again, put them in the bin, don't sell your troubles to someone else (trade in is ok) or keep them around for old times sake, they wont heal and repairs are obviously temporary. Your smart, you know the odds are never in your favor.
Doc