Original 4020153-04 Type Ampex MM-1200 Bias Module Extender, Good Condition. I'm not sure if this is an original Ampex part or not. It doesn't look home made but it doesn't have the typical Ampex markings. It may be an early version of this extender. It's shorter than a standard Ampex extender and doesn't have a bottom, but has the correct connectors and will work as described. Good condition..
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