Linn Tuner Modules for Kairn, etc.

When I first started looking at Linn gear some 10 years ago now I seem to recollect that in additon to seperate tuners, such as the Kremlin, Linn also sold a tuner module that could be installed in a Kairn or other pre-amp. Am I correct, and if so, does any one know what they were called, and how they sounded?

Thanks,

Brock