[R-390] Another R-390A question

[Dave Maples]

Gents: All this discussion has prompted me to wonder about the performance
of my R-390A.  It's probably stupid question time, but after watching the
responses I'm willing to throw another one in the pot.

I have never had the courage to pull the RF deck out (the gears don't bind,
everything is free, all the coils have tuned, etc.).  I have completely
recapped the IF and AF / PS sections.

Here's my question:  When I rotate the RF gain counterclockwise on my 390A,
there is minimal effect on overall sensitivity (some reduction, but signals
are still clearly audible).  Recently I worked on another R-390A for another
fellow, and lo and behold when the RF gain control was turned CCW the
receiver would quiet right down to nothing.  I've only had the two to look
at (never owned or used another one).  Which kind of behavior (some
reduction or lots of reduction) should I expect?

Thanks,
Dave WB4FUR