One of the original op-amps gave out and was replaced around 1998, the other three are original to the unit, two of which are labeled Huntington, N. The unit has phantom power controlled by a toggle switch on the back panel. Please let me know if you have any questions. The item "Vintage API 3124 Huntington Op Amps" is in sale since Wednesday, August 24, 2016.
This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Preamps & Channel Strips". The seller is "tcbf3" and is located in Seattle, Washington. This item can be shipped to United States.