I just purchased a used PermaPak System 6 and Rechargeable Battery Pack Module For Flash Units, in very good condition, and a Quantum Flash Cable with Module to fit my Minolta 3600 HS (D) Flash Unit, that also fits my Sunpak PZ 5000AF Flash Unit. The Control Module has Two Output Sockets for two Flash units.
So far, searching the internet turned up almost no info on the PermaPak System 6.
I did find out that the PermaPak Company is (was?) a Division of Photoco, Inc., and, that it was imported by the Mamiya America Corporation (MAC), but No Dates.
If anyone has used one for their Flash, and still has one, and/or, has any detailed information on it, please post a reply. It would also help to know the Year's it was Produced/Manufactured, the number of Flash Cycles Per Charge and Recycling Time, Charging Voltage info, Etc;.