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I am in the process of upgrading a Lite DAC-83, and I have seen an "unknown" circuit, which has its reference erased: it is located on the upper right corner of the attached photo:



Anyone knowing what is this circuit reference ?


More important: I am looking for the Service Manual in rder to understand what parts can be upgraded, but no way to find it, and no way to find the manufacturer website: any information on who is the manufacturer ??


Thanks !

Edited by Nounours - 10/9/12 at 12:49pm