Note: Almost ALL Ampex 350 Electronics are sold WITHOUT the necessary Power Supply !!
and they are impossible to find for sale anywhere. So unless you
can make your own high-voltage power supply yourself, do NOT buy a Ampex
350 electronics unit UNLESS it has the original power supply and connection
cable AND the special old-style AC Power Cord (also impossible to find)
Ampex 351 electronics have an internal Power supply in each unit
but still have the hard to find old-style AC cable, so make sure you
buy a unit WITH the original AC cable or that the unit has been modified
to accept a standard AC cable with ground.
In all cases you MUST have a qualified tech change the AC connector on
the 351 or 350 to a standard IEC grounded cable,
and PROPERLY GROUND THE CHASSIS.
Also have your Tech REMOVE the wiring to the rear 'Jones Connector'
as it has LIVE AC on it !