This is a simple dummy plug inserted into the transformer socket. Here I've popped off the metal shield so you can see the transformer windings:Īmpex 351 Input Transformer DiagramIf you can't make out the windings, don't be concerned. Here's the base of the part that came in this Ampex:Īmpex 351 SchematicThe base looks just like an octal power tube and it plugs in in the same way. That's how the input transformer plugs into the socket. Here's what the socket looked like in this unit when it came to me: If this socket is empty, think of spending just shy of $100 to put a transformer in there. Good quality input transformers don't come cheap. For balanced line recording, two input transformers are available to replace the dummy plugs. These dummy plugs jumper pins 3 and 4, pins 6 and 7 and pins 2 and 8 (these two pins also connect to ground and the dummy plug shield).
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