I talked with a local electronics store that has been around since the 50's...
They said that something can be done with a switch, but due to the fact that the pre-amp and amplifier are combined, there would be high distortion and that people with these should simply stick with vinyl and do NO modifications.
For now, I guess I just have to stick to vinyl... I would however like to purchase a tube amp sometime in the future and start listening to my tunes with that. Any good reading on this on the web anywhere?
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I have uploaded a .doc file of the owner's manual (retyped and with images inserted) along with .pdf scans of the original manual.
.DOC Motorola 6K22-1 Owner's Manual:
http://www.mediafire.com/file/bmgzwj14r2l/Motorola Owner's Guide - 6K22-1 Series.docx
.PDF Motorola 6K22-1 Owner's Manual (Scans):
http://www.mediafire.com/file/f25voc2dz2y/Motorola Owner's Manual (6K22-1).rar