Installed a pair of telefunken 12at7 tubes which really improved the sound. The item "Summit MPC 100A tube mic preamp/compressor telefunken tubes" is in sale since Saturday, January 28, 2017. This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Preamps & Channel Strips".
The seller is "773steveng" and is located in Chicago, Illinois. This item can be shipped to United States.