This preamp was built based on the schematic that Master Kondo of Audio Note introduced in 1991 year. This is the first version of M7 Preamp which phono stage used CR type

This is order made item. For the safety reason, the wooden case you saw in pictures is available only in Japan. Outside Japan is iron case chasiss , that is same as this one https://soundgate.net/old_version/html/product/ODQy.highend

Using parts inside amplifier for order made version

Duelund coupling condenser for output
Top class oil condenser and resistor on phono stage.
Very strong iron chassis
Power supply is separated to cut off noise, hum from power supply.
Signal path for phono stage is separated to prevent unexpected noise, hum.
Point to point wiring, no PCB
Zero NFB schematic
Phono stage is CR type.
All tubes are included.

You can price down the amp by down grade the parts using inside the amp, but I highly recommend you using parts that I recommended above.

Sound is very wide range, quiet and detail. No color is added to sound, true sound, live and dynamic.

Tube using in amplifier
Recitifier tube : EZ-81x2
Phono stage: 12AY7 ( 12AT7) x 4
Line, AUX stage: 12AY7(12AT7)x2

Specification:
Line, AUX:
Response frequency 10Hz ~ 80KHz
Hum level: Under 0.1mV

Phono stage:
Response frequency 20Hz ~ 18KHz
Hum level: 0.12mV