Contact Us




Unison Research Unico Amplifier Repair



The Unison Research amplifier was leaking DC into the speaker, causing damage to the speaker.     This has been one of the most difficult repair jobs we have encountered.  This is the 3rd Unico of the same model belonging to differrent people entering our repair lab.


Due to awkward industrial engineering layout, the majority of the components are not accessible unless if we disassemble the entire amplifier, which means it has to be reassembled and dissembled again, over and over for every segment of repair and testing.   


The amplifier requires the replacement of the biasing circuit board together with changing certain damaged components such as transistors and resistors.  The repair was done in collaboration with Unison Research who was kind enough to provide schematics and parts for the repair.


Unfortunately, minor hidden problems took us a painstakingly long period of time to diagnose.    The repair process was documented on audiophile forums.  Luckily, we were able to get the job done so our reputation was preserved, and was feedback was to the positive.



Total Cost of Repair: $ 350.00

Turnaround time: 6 weeks.









 Contact us: info@excelstereo.com             416-523-6655  Phone Lines Answered from 6 pm to 9 pm daily.


Store visit by appointment only, do not show up without an appointment