The circuit design is referenced to Matisse Reference tube preamplifier. It supports MM input with RIAA compensation. It uses one 12AX7 and 12AT7 vacuum tube in common-cathode configurations to provide sufficient voltage gain for weak phono input signal. The signal path of this PCB layout is designed in symmetry for both channels. Dedicated powerrails, ground, and signal paths, altogether are taken into considerations so that all are to minimize the parasitic, cross interference, and influence of RFI.
One 12AX7 and one 12AT7 vacuum tubes.
Support MM input.
Two single-ended inputs and two single-ended outputs.
Symmetric layout design and signal paths with minimum parasitic.
Dedicated ground and power rails layout design.
Two large reservoir decoupling capacitors for power rails.
Power requirements: one 400V (20mA) DC and one 12.6V (0.5A) DC.