hi all,
i am also an fmtunerinfo.com contributor, & a contributor to its sister yahoo tuner forum. i also am hard on the m-d tunas. what's been said about vintage tunas is certainly true, imo - many will sound better than even m-d's best, even before mods. and at a fraction of the cost. i have owned >80 tunas over the past few years (i still have >20), and i would take any of them over the md-ft101, for sure. among them, i have owned a bill ammons modded kt7500 discussed here, & i agree that it *is* a fantastic sounding tuna. but not in *my* personal top group. mostly because its ultimate quieting was not as good as most of the others. and, others have also noticed this about the kt7500 tunas.
re: the dyna fm3, i also own one that was extensively modified, but i was unable to get a good read on it, because it started acting up the second day i got it.

but, it's certainly worth fixing, which i am going to do. (or more accurately, likely have someone else do it!

) one of the reasons i think it will be worth it, besides my initial impressions, and what others have said about this tuna, is what i read about it here:
http://www4.head-fi.org/forums/showthread.php?t=205144and, also there is the fact that i have been extremely impressed w/a few other tubed tunas - the sherwood s3000 series, the stromberg carlson sr445, & the (extremely rare) sansui fm8. all these sound world-class, imo, w/no mods whatsoever. the ones i have, however, are all mono, & i used a couple of different mpx stereo decoders with them. and, the sr445's sensitivity & selectivity is mediocre; you really need a strong signal to get good reception & sound with this one. these inexpensive tunas, w/a mpx decoder, make me wonder why i am still holding on to my heavily modded, completely refurb'd mcintosh mr65b. i guess i jut like tunas! aa
speaking of good reception/sound, a quality antenna is extremely important, especially if you have difficult reception conditions. you should definitely consider a roof-mount yagi if at all possible...