McIntosh MC275
McIntosh Laboratory long held a reputation for producing very high quality high-end equipment in the US. The model MC275 was produced from May 1961 through July 1973.
The model MC275 perhaps demonstrates most clearly the revival in tube amplifiers, as used MC275s in mint condition can sell for up to eight times their original purchase price, and a "Commemorative Edition" made during the 1990s was priced at $4000.
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