“TENS jr. is the little brother of the studio spring reverb TENS.
It features TENS model 5 – tank A. The properties of the reverb have been extended compared to the unit from the late 70s/early 80s, it’s been modeled after. So a single tank is stereo now and the range of decay times has been extended to 0.5 to 20 seconds.
The reverb’s character can be altered drastically with the associated horizontal fader.
In contrast to classic spring reverbs found in guitar amps, organs or some synths, TENS jr. offers very high reverb density, fast build-up, and very low “boing” artifacts, making it sound almost plate-like.
(version 1.0.6) ”
Source : klanghelm.com