As zavato mentions, cj does have that "Golden Sound" to match up with their golden faceplates. My guess would be that a cj tube pre matched with a cj tubed amp may in some systems be a bit too much of that golden glow.
+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.
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