+1 on gears need to match. Some CJ preamp models tend to have unusually high gain and depending on the pairing amp you may not be able to move the volume control past 9 o'clock for most listening conditions. Check the (gain) specs carefully before committing.
Re Coppy777's question if I miss that something you get with tubes- with the Pass gear, truthfully, not at all. However, if I truly do need or want a tube fix, it's not beyond my reach. I have built a couple of tubed headphone amps.
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