Check the listing for details. All New Altec 9475A Preamp. Color: Green, Condition: New. Listed at 595.00 USD. New Altec 9475A Preamp Ready to Plug n' Play You are looking at a new Altec 9475A microphone preamp. Everything is new in this 9475A pre-amplifier build. Uses Lundhal transformers, new printed circuit board, new electronic components with correct spec tolerances, matched hFE tolerences on transistor pairs, XLR input & output connectors, ready to be connected to a 24VDC regulated power supply and put into service. Each listed 9475A preamp has been tested. I operate each new build for 24 hours to confirm there are no issues. Preamp comes with brief instruction sheet detailing how to connect to a power supply and operate. Also comes with a schematic as well as data sheets for the Lundahl input and output transformers. EASY TO INSTALL: Connect the Red wire to the Positive "+" (B+) terminal of your regulated Power Supply, connect the Black wire to the Negative "-" (B-) terminal of your regulated Power Supply and connect the Green wire to the Chassis Ground of the regulated Power Supply. Connect the XLR labeled "OUTPUT" to your mixer/console/amplifier and connect your microphone to the XLR labeled "INPUT". This new 9475A pre-amplifier operates and sounds as good as an original Altec 9475A. The electronics in this preamp are exactly the same as an original Altec 9475A preamp. Original 9475A transformers manufactured by RoboCoil are obsolete, therefore transformer equivalents made by Lundhal Transformer replace the obsolete RoboCoil transformers. You can spend nine-hundred dollars buying a fifty plus year old Altec 9475A, sort out the Amphenol J-102 pin configuration so you can hookup input & output connectors and power supply wires or you can spend hundreds less and buy a brand new 9475A that is ready to plug n' play. Pictures of the new Altec 9475A sitting alongside an original Altec 9475A are for demonstration purposes only. Only the new Altec 9475A is for sale. Shipped via Fedex, Insured with a Tracking Number. 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