Tweak AM rcvr 4 1700KHz
The AM broadcast band is expanding up to 1700KHz soon, and some AM 
radios can be adjusted to accomodate this new spectrum.  The 
radio should have vague calibrations, as the calibration 
would otherwise need to be changed.  We're talking about analog tuned 
radios, like cheap portables or clock radios.  
Practice on a radio you don't care about before you attempt a good radio!
Step 1:  You'll need a 1700KHz signal source, perferrably AM 
modulated with a tone.  Also tunable to the range 530 to 
1710KHZ.
Step 2: See how far the radio will tune before you touch any 
adjustments.  Maybe it already is capable of getting 1700KHz.
If not...
Step 3:  You need to identify the purpose of all trimmers and 
adjustments in the radio.  Assuming no RF stage, look for: antenna 
trimmer cap, oscillator trimmer cap, oscillator tank coil, Antenna 
loopstick (hopefully, the wire is wound on a slidable paper 
coilform), and the IF coils.
Step 4:  Mark, with a fine point magic marker, the orginal positions 
of all cap and coil adjustments, so you can return them to their 
orginal setting if this procedure doesn't work out.  Look to see if 
the osc and ant trimmer caps are currently set at about their 
midpoints, not at or near minimum capacitance.  If they are near or 
at minimum, stop.  This procedure then won't work with that radio.  
Step 5: Set the signal source to 530 KHz, and check that the radio 
can tune that in, and then see how far the radio can tune the upper 
end.  Also tune in radio stations of known frequency and zerobeat the 
generator, as a check on the generator's accuracy.  Now find a 
station at or near the top end of the band and "walk" it doun your 
dial a little bit  by making small adjustments of the oscillator 
trimmer (turn for less capacitance on the trimmer).  
Tune to the bottom of the dial, and adjust the osc coil to bring back
the bottom of the band (530).  Repeate this process a few 
times, as you walk the station at the top of the band down.  Check to 
see if you can receive your generator set to 1710KHz yet (Gives 
the radio a little leeway for temperature and whatnot drift over 
time).  
Step 6:  Now that the radio can tune 530 to 1710KHz, you'll need to 
tweak the antenna LC circuit.  Tune a station near 620KHz, and slide 
the antenna loopstick coil (avoid putting your fingers on the coil 
itself, touch the ends of the coilform with fingernails or such) 
for max signal strength.  Now tune a station near 1480KHz, and tweak 
the antenna trimmer cap.  repeat process a few times.  

You shouldn't need to touch the IF strip.

That should do it.  Enjoy the new stations when they sign on.
Proceed at your own risk