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I like the PreSonus Blue Tube Duo (2 inputs and one 12AX7 tube), and I recently picked up (from a pawnshop) an ART Tube Pre which uses a 12AX7A. I haven't tested the ART yet, but I hope to this week.
Both are portable, but it should be noted that they each require the use of an AC adapter/wall-wart. I hate wall-warts, so it's a love-hate relationship...
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