Mark Levinson Model 20



A pair of Mark Levinson No. 20 Monoblock was brought into our store with a very high noise level in 1 channel.    It failed our bench test on distortion, stability and S/N Ratio.


Diagnostics revealed faulty transistors and zenar diodes which were replaced.    The bias was re-adjusted, and the amplifier was burned in for 48 hours.


The repair was successful, and bench test met factory specification.





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