The older SP-600JX receivers used a twinax antenna connector. Amphenol made the UG-103 for this purpose. This is a lot of 2 female -panel-mount connectors. This connector will NOT fit the R-390 - it is a very different connector..These connectors are old but don't seem to have been used. There is no solder in the solder cups. They are tarnished and no longer shiney. There are spots of corrosion as well..

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