Wowless

This damping device results in absolutely uniform and “wowless” rotation of the synchronous turntable.

Source: wiktionary

If for no other reason, the difficulty of obtaining a wowless speed at 16⅔ rpm should be enough to unsell any music lover for his high-quality listening system, especially with changers or low-priced turntables.

Source: wiktionary

1990, Stanley R. Alten, Audio in Media, Belmont, California: Wadsworth Publishing, 4th edition, 1994, Chapter 16, “Insert Editing,” p. 517, To get a wowless insert edit, you will have to preroll not only the master tape but the insert tape as well

Source: wiktionary

An audience of young instructors and their wives, symbolically entertaining Dr and Mrs Dreyer, will be symbolically thrilled to catch the Dean in an anecdotal mood, mooning and mumbling with a fuddled smile through a maze of wowless sagas, into which George and many many others will enter, uttering misquotes.

Source: wiktionary