looking for quadraphonic 8 Track record cartridges

QuadraphonicQuad

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As far as I know, and I haven't tested this theory, the only difference between regular 8 track and quad cartridges is that knocking on the top of the tape, but that may just be a switching device for tape players that play stereo or quad.

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It looks like there may be some quad capable blanks on eBay under "Columbia 8-Track ConvertaQuad Cartridges", which on the cover say "Remove Slug for Quad Insert Slug for Stereo"
 
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