conrad johnson preamps


Why are there so many Conrad Johnson preamps for sale on the gon?
g11657
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CJ products are top notch for both build and execution, plus I have never heard anyone say that it is anything but easy on the ears.
Actually I looked for used CJ tube amps & pre amps for months and found very few for sale. Finally struck a deal with Spearit Sound for new CJ gear.
I've also been eying their preamps for sometime but the large variety of the models they made over the years makes it difficult to pick a "good" model. I'm also concerned about their high gain causing mismatch with my amplifier's high input voltage sensitivity.