Package include
1. M7C Tube Preamplifier  Kit(Stereo)
2. T30 R-core / Toroidal Power Transformer 
3. Assembled Dale 24 Step Ladder Type Attenuator 100K for Volume Control (Stereo) (knob not included)

Introduction
Circuit design is modified based on the classical Marantz 7C and the values are optimized. It produces sweet and detail sound. Capacitors in audio grade are used for high voltage filtering and AC signal coupling. Low voltage dropout regulator LT1085 is employed in regulating power supply for tubes filament, which gives a maximum output driving current of the IC is 3A which is far enough for filament power supply. To enhance the performance of the power supply unit, the lengths of power routing path and signal paths are minimized so as to minimize the total path impedances. The placement of the components of the built-in rectifying and regulating circuits are packaged closely together and are far from the amplifier core. Also the R14 and R30 are provided for an alternate the biasing at second amplifying stage.

 Features
1. Three Shuguang 12AX7B.
2. Use of  Solen / WIMA MPK10 capacitors, Nichicon Audio capacitors, Philips BC / BHC Averox capacitors, and Dale resistors.
3. Dedicated power and ground rails for tube power and tube filaments.
4. Symmetry in layout design for both channels.
5. Power requirement: 110-115V AC/220-240V AC 50/60Hz
6. PCB dimension: 110mmx200mm, thickness 2.5mm and 2oz copper, two layers.