MEASUREMENTS
When I unpacked the Riviera Levante amplifier and lifted it onto the test bench, it struck me that this is actually eight amplifiers in one. It has balanced and single-ended line-level inputs. Its output stage can be operated in class-A or class-AB. It was supplied with two choices for the two input stage ECC81/12AT7 tubes: vintage Mullards or modern JJs. Add to those variations that the Levante has a headphone output and an optional phono stage (not fitted to the review sample), and it became clear that I had a lot of testing ahead of me.
I decided to focus on the Riviera amplifier’s behavior with the Mullard tubes and the unbalanced inputs, performing every test in both of the output-stage modes. I then repeated some of the tests with
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