Mpearson,
You hit it with the jump factor comment. IMO you just can't get this with transformers. I've not tried the Kondo or ultra expemsive Audio Note... but have tried the moderately priced AN ,EAR,jensen and some highly touted microphone transformers too. Quiet and dull was my impression. They were of the correct turns ratio for the cartridge to see the right impedence.
Some will like this eery "undynamic" sound that is quiet. However, I fall into the active camp. At the twilight of the LP during the mid-late 80's many high end designs, "classics" were put to rest: the Sp-10, SA-2,Roger Modjeski's RM-4.... As the industry went to line stages for CD and add on phono for LP for the loonie fringe, lack of demand resulted in an absence of good thoughtful design(transformers) for active stages . Now there is a rennisance and some very good active stages are available.
For example, just listen to the Manley steelhead with and without the transformers,even though there's solid state devices in the path, the difference without transformers is not subtle.
For the SA-2 the soviet 6h23n is a good rugged tube that is quiet and works well. The 6dj8's are paralleled for each channel to form a giant triode of sorts with better S/N ratio. Roger Modejeski RAM labs can supply ultra quiet tubes at a price. The original Yugo's were not bad tubes either.