R/S 15-2525 Stereo Modulator
 

I suppose this is a piece of test equipment these days. Now, as I understand it, this is a REAL stereo modulator that puts out MTS stereo.
Has anybody had any experience with this unit? There are several on Ebay.
Also, there is a Channels Plus 5601 encoder that can be used with any mono modulator. Has anybody ever heard of that? Thanks.