I know nothing about the preamp. My purchase at J/J was a Sony dual cassette deck - a commodity item. The entire transaction was flawless and the salesperson was helpful. Best of luck.
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My friend swears by his $5000 300B set amp from JJ. He has them driving his lowthers. I have also heard great things about their tubes. I believe their products are top notch, all meticulously handmade in Slovakia and provide great value. When I go tubes I will go with JJ, as the Canadian distributor is a few blocks from my house.
I'm not sure if you are the same guy who emailed me, if so, disregard.
I bought a JJ Electronics 243 preamp a few months ago and I am very happy with it. It has a very good MM/MC phono stage as well. I directly compared it to a Modulus 3A and a BAT VK-3i. It beat both of them, but the contest was a little closer with the AI than with the BAT, where it clearly outshined that preamp.
Build quality is very good and it is quite a handsome piece. I feel it is quite a bargain at the asking price.