Does Anyone Know Differences Between Marantz SR-18, SR-18EX, and SR-18U, please?

be83663
be83663 Posts: 192
edited January 2011 in 2 Channel Audio
Hi, could anyone tell me differences between Marantz SR-18, SR-18EX, and SR-18U please?
Which ones are the latest or the oldest?
Thank you.
Ken.
:confused:
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