I would skip the KT500 completely. I can't, for the life of me, justify its existence based on my testing of it.
The KT200, when I tested it for gain and noise figure five years ago, tested well. I didn't have overload testing ability at that time, so I've not investigated that aspect of it.
If in doubt, stick with one of the medium gain pre-amps, they will, at least, keep4you out of overload trouble. You can always add a distribution amp down the line if necessary.
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