There is no IF selectivity switch on the MR-77, that's what the MR-78
is all about! The MR-78 is an MR-77 with some added bells and
whistles, the switchable IF selectivity is the most important one,
the only one I can remember.
--- In FMtuners@y..., Charles Peterson <charlesp@d...> wrote:
Now that the MR78 trades for a small fortune on eBay, the lesserMR77 is
getting attention as a near-equal substitute. When I get around tobuying
costlier tuners, this model is near the top of my list.appear to
be such a switch on the front panel, only mode selector, stereofilter,
muting, volume, and tuning.bandwith in the
"Muting Off" position. In most cases, I think the proper selectionfor muting
is OFF, if not REMOVED FROM UNIT.substantially)
better on the MR78. MR78 maximum adjacent channel selectivity is55dB while
MR77 adjacent channel selectivity is "only" 47dB, a full 8dBdifference. Of
course, even 47dB is pretty incredible adjacent channelselectivity, with even
other "supertuners" like my Sansui TU-9900 only specing at 22dB.