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Gladding-Claricon plug-in decoder cartridges



Gladding-Claricon plug-in decoder cartridges

Here is a picture of the Gladding Mark 200A's two plug-in quadraphonic decoder cartridges. The Claricon name is clearly visible on the case. I am wondering why Gladding and Claricon decided to make the cartridges removable. Is this common? One of these is CD-4 (orange), and the other (blue) is a SQ/RM combo.