Oppinions on getting an add-on FM-MPX decoder

[DavGoodlin]

I have two Sherwood S-2200 tuners that have a 4 inch square covered opening on the chassis all ready with a receptacle for the MPX adapter (audio connex, filament power, B+ ,etc.) No luck finding one. Oddly, these Sherwoods have separate tuning for AM with wide and narrow filters, so they may have been used for those AM-FM stereo simulcasts.

I once had an all-tube Harmon Kardon F500x tuner with the optional on-board decoder, which was rare on a 1962 model. I still have the matching sweetheart of an amp (H-K A300), but the tuner given to a friend long ago.

I suppose, by the time stereo decoders became integrated as standard on new receivers around 1963, nobody would bother with the mpx decoders to refit the older mono units, especially with solid state taking over.