This article is from the rec.audio.* FAQ, by with numerous contributions by Bob Neidorff others.
A tuner is a radio reception device which can not drive
speakers. Sometimes, the radio in a tuner is higher quality
than the radio in a receiver. A tuner may or may not receive
the AM broadcast band, but 99.999% will receive the FM broadcast
band. Some also receive short wave bands, frequencies used
for long-distance rather than for local commercial broadcasts.
 
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