Retro Gear Shop is a high-end boutique store located in Nashville, Tennessee. RCA OP-7 Portable Mixer #1232 For sale is a rare RCA OP7 4 channel vintage tube mixer. This just came back from full professional restoration servicing and is fully functional. It's in good shape and working perfectly.Check out the pictures to make sure you like it. This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Preamps & Channel Strips". The seller is "retrogearshop" and is located in this country: US. This item can be shipped worldwide.