I don't know if Cary has balanced outputs but you already know you like the sound so that is logical. The other plus about Cary is that most of their preamps use 6SN7 tubes extensively. These tubes are readily available as Old Stock even true NOS. You can roll the tubes until you get the sound you want.
I don't know if Conrad Johnson preamps have balanced circuits but many of their older preamps have that warm sound you seem to be hankering for.
I don't know if Conrad Johnson preamps have balanced circuits but many of their older preamps have that warm sound you seem to be hankering for.