CT3 MM MC Phono Preamplifier (Stereo)

CT3 MM MC Phono Preamplifier (Stereo)

The circuit design is referenced to VTL phono tube preamplifier and the design values are optimized. It supports MM or MC phono input with RIAA compensation. It uses four 12AX7 vacuum tubes in serial common-cathode configurations and buffer stage to provide sufficient voltage gain for weak phono input signal. The input impedance can be changed by the DIP switch. The signal paths of this PCB layout are designed in symmetry for both channels. Dedicated power rails, ground, and signal paths, altogether are taken into considerations so that all are to minimize the parasitic, cross interference, and influence of RFI.