I think that conrad-johnson had a reputation of a warm, golden sound in years past. Their more recent preamps have a more neutral sound as many other tube preamps have also become more neutral. The warm, colored sound has gone out of favor for tube preamps.
For c-j this move started with their Premier 16 and Premier 17 preamps. Those are considered good preamps and may still have some of the old c-j sound. So their preamps became progressively more neutral after those and are more colored before those.
I don't know if c-j made gear to work with European voltages. I'd guess that you can find European tube gear with the warm sound you're looking for. If you really want to try c-j gear, you can find descriptions and specs on their website, and you can find the gear for sale using the Hifi Shark search site that monitors many audio market websites.
For c-j this move started with their Premier 16 and Premier 17 preamps. Those are considered good preamps and may still have some of the old c-j sound. So their preamps became progressively more neutral after those and are more colored before those.
I don't know if c-j made gear to work with European voltages. I'd guess that you can find European tube gear with the warm sound you're looking for. If you really want to try c-j gear, you can find descriptions and specs on their website, and you can find the gear for sale using the Hifi Shark search site that monitors many audio market websites.