Mehmet, I owned a Krell HRC pre for many years, at least 10 years. There was one to my knowledge factory upgrade made to the power supply. As you know the HRC has an external power supply. I had this done to mine. I don't recall there was much difference in the sound with the new power supply.
You should if you can find out using the serial number whether your HRC already has the upgrade.
Best,
Charles
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