Ampex Input Transformer 4580200-02 is a balanced-matching transformer with an impedance of 600 ohms. See further details from Ampex AG-600B manual below:Ampex plug-in Input Transformers For recording from an unbalanced line, the dummy plugs (4030034-30) are used. 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). For balanced line recording, two input transformers are available to replace the dummy plugs. Transformer 4580200-01 is a balanced-bridging transformer with unit gain and an input impedance of 20K ohms. Transformer 4580200-02 is a balanced-matching transformer, which provides a 14dB gain and an input impedance of 600 ohms. On both transformers, pins 4 and 8 are the primary signal input, pins 3 and 2 are the output and pin 1 is the case shield. (from the Ampex AG-600B user manual)
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