Tube gear experienced the start of their resurgence in the 1980s as the CD first appeared. For reasons already mentioned, the extended high frequency response of digital playback sounded harsh on most systems tweaked for LPs. So the reappearance of tubes, from manufactures such as McIntosh, Conrad Johnson and Audio Research began. However, 1980s "sound" for pop music production leaned hard into intense treble. Lots of synths, drum machines and sequencers in the early 1980s, resulting in lots of treble heavy productions, esp. for dance/pop and "new wave":