Thanks for using our Answers Forum. I understand that you have some questions about the power supplies. I have an article, US/CAN: Which power supply Unit came with my Slingbox that should provide some of the answers that you are looking for. These 2 power supplies, the V-Infinity and the Ktec are interchangeable provided the Voltage matches.
Hope this helps.
Sling Moderation Team
thanks for getting back.
I have two UK-Slingboxes. Should the "V-Infinity" power supply fail, I shall feel confident in replacing it with a "Ktec" one, since they both have the same voltage (5 V). I still don't quite understand why the Sling Support Agents want to know the manufacturer if they are indeed interchangeable - but I'm probably missing something!