...that does have me wondering........?
Wondering is a good sign!

And one can have fun with wondering.
For example, one can go google dot com and execute a search for the exact phrase "tape drive circuit", regardlessly whether the wonderer does or doesn't know that technically speaking there's no such thing

, but hey - FUN is FUN!
Click here, shortcut provided

:
http://www.google.com/search?hl=en&q=%22tape+drive+circuit%22&aq=f&oq=
Then after reading through "results" (there are not too many of them, btw ..heh heh), one can start REALLY wondering.
One thing will be clear: the "phrase" will not lead a wonderer to even a one single text-source that has anything to do with an actual analog tape recorder, instead the wonderer will land in the pile junk, known as "ProAudio World", the granpa of which Mr Rupert N. apparently
is, or better say -
happen to be by a proclamation of that very "ProAudio World's" stooges.
And, so, Richard, it only takes to be a "GranPa" of "Pro-Something", and then your phrase with wings
"their vintage pops and clicks" will appear in various "well respected" pro-something publications. The fact that the phrase was a typo, an unawareness based technical nonsense or a deliberate camouflage/masquerade - it would not matter, it will never be challenged, nor questioned, with exception of maybe couple of wonderers somewhere in the void.
So, wonder, gentlemen, oh Please, wonder !!!! 