You are thinking it would be cleaner to input any amp RCA from the Jenson piece?Not necessarily "any," but some and very possibly most, especially in the price range you are considering. Based, as I said, on anecdotal reports that have been provided here and elsewhere.
And are you sure the transformer won't degrade the signal?I haven't used Jensen transformers myself, but a number of highly experienced members here who have **very** high quality systems have reported excellent results with them.
I tend to lean toward a "less is better", minimalist view of a signal path.Likewise in my case. But there are exceptions to every rule, and I suspect this is one of them. And as you alluded to, the transformer may be simply taking the place of a low quality op amp device that is used in many designs to interface between a balanced input and an unbalanced internal signal path.
Best regards,
-- Al