12AX7 Phono S1 MM / MC Preamplifier Full Kit (Stereo)

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Quick Details
Brand Name:
Analog Metric
Model Number:
12AX7 Phono
Professional Amplifier
2 (2.0)
Place of Origin:
Hong Kong


Four 12AX7 vacuum tubes.
Support both MM and MC.
RIAA compensation.


The circuit design is modified based on VTL phono tube preamplifier. It support both MM or MC phono input  with RIAA compensation. It uses four 12AX7 vacuum tube 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 is designed in symmetry for both channels. Dedicated power rails, ground, and signal paths, althogether are taken into considerations so that  all are to minimize the parasitics, cross interference, and influence of RFI.



  • ·         Four 12AX7 vacuum tubes.
  • ·         Support both MM and MC.
  • ·         RIAA compensation.
  • ·         Input impedance can be varied by DIP switch or modified resistances by advanced users.
  • ·         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.
  • ·         Four large reservoir decoupling capacitors for power rails.
  • ·         Power requirements: 110-115V AC/ 220-240 AC 50/60Hz
  •         PCB dimension: 20.2mm (W) x 13.6mm (L)
  • ·         PCB thickness: 2.4mm, double layer, 2oz copper.


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