After Ampex/Quantegy went out of business, I had questions whether I could tolerate the sound of new tape... some of it sounds worse than PCM recording - just my opinion.
@moonwatcher Tape does not have much of a 'sound'. Tape technology does. In case you are not aware, new tape is being made by ATR Magnetics https://www.atrtape.com/
-and it 'sounds' just fine; every bit as good as the Ampex/Quantegy. But of course, any time you change the tape you're recording with the bias on the record head should be optimized for the tape or it won't 'sound' right. So it might sound bright or otherwise unpleasant if the bias is off. If you've run into this and think its the tape, its really your machine not being set up right.
Beyond that any properly functioning tape machine will express a bit of 3rd harmonic at or near 0VU (when properly calibrated) which adds a bit of warmth to the sound.