FWIW, 'transparent' means, to me, a lack of anything additive to the source, i.e. grain, distortion, variations in FR such as added warmth or an increase in selected frequency gain to inhance the appearance of 'increased detail' or 'resolution' (Gee Ma, I can now hear so much that I could never hear before I got this thing. Wow. The 3 months or less later you see a post to the effect - 'I get fatigued in long term listening, how can I cure that. Maybe a new cable, source, tweak'.)
So, to answer your question - You can't have too much transparency, but you can get a FR response that is not synergistic with your other equipment or your tonal expectations.
If you want a 'warm' system and think a tube pre-amp will do it, just fess up and seek one out. ARC stuff is typically neutral and some of their units are voiced on the cool side of neutral if anything. If you expect them to warm up the tonal balance of your system it is likely you'll be disappointed. Not as opposed to SS just what is available in other tubed pre-amps.
So, to answer your question - You can't have too much transparency, but you can get a FR response that is not synergistic with your other equipment or your tonal expectations.
If you want a 'warm' system and think a tube pre-amp will do it, just fess up and seek one out. ARC stuff is typically neutral and some of their units are voiced on the cool side of neutral if anything. If you expect them to warm up the tonal balance of your system it is likely you'll be disappointed. Not as opposed to SS just what is available in other tubed pre-amps.