seven second delay?

[rogerkirk]

Ron Bello wrote:
>In the 70s, BZ had a audio tape loop that ran between 2 15-inch reel 
>to reel machines for their 7 second delay.  One has to assume it is 
>all solid state today.

Similar setup at WRKO for the Sunday night talk show.
One Ampex 350 tape deck.  Erase head disconnected.
Record & playback heads reversed.  One 7x7.5" loop of tape 
running around external pulleys.