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Did you see the recent review by Danny on the discrete op amp by Sparkos?Both my SACD player (Sony XA-5400ES) and Blu-ray player (Oppo UDP-203) have discrete op amps that could be upgraded with the Sparkos discrete op amp. However, I opened both machines and failed to locate where they are.I am in Northern California, are you able to work on my disc players and replace the op amp?