Quote:
Originally Posted by STurtle
Any electrical connection between STB and Receiver yields the hum.
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It seems that you have done all that could be reasonably expected to prove it is the VBox. Its call out time, I think.
If it was me, I would have a separate source on hand to demonstrate to the engineer that the same cables, and amplifier channel do not hum with other sources.
There can be no argument surely.
Hope you get it fixed,