Even so, no big deal, generally harshness would vanish somehow quickly and bass will get tighter. You can have the pleasure of knowing how a particular tube will sound in its lifetime.
For new/NOS tubes, transducers (cartridge, speakers), new amp...etc. I’ve always just listened to music and not sweat the burn in. If a piece is defective or you just don’t like its sound in the context of your system, you’ll know if from the onset and burn in won’t help much, or at all. Music is more enjoyable versus pink noise or test tracks.
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