the 7 is the classic tube design...it was also brought back by the good folks at audioclassics and vac for a limited run as the 7 seriesII. the 7c is a solid state design. the 7 has been with me for longer than any other component(18 years)and although i have purchased several fine preamps over two decades of this hobby , the marantz is indeed graced with that intangible 'something' that makes every recording (new,old,rock,jazz,classical,cd,vinyl)sound absolutely natural....it commands that high price in the used marketplace because it is still indeed a reference product. the re-issue was also outstanding...the 7c however has been ecplipsed by other designs, though it is still more versitle than most....by the way, the 8b is a power amp.
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