the Ampex 350 and 351 tube electronics pages

Information and Tips for using the Ampex tube 350 and 351 electronics as a tube Mic pre-amp

the Difference between the 350 and the 351 Electronics

Electronics Schematics from the 350 manual
this is at our Ampex Manuals link - scroll thru the Ampex page

Complete 350 manual (from 1954 !!)
this manual is at our Ampex Manuals link - scroll thru the Ampex page

Complete 351 manual
not yet done

Tips for using the 350 or 351 as a Tube Mic Pre-amp
not yet done

Pictures of various 350 and 351 Electronics

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 should have a qualified tech change the AC connector on
the 351 or 350 to a standard IEC grounded cable, and properly ground the

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