ZERO-ZONE PRT-11A preamplifier reference - American Gary CARY-AE1 circuit, the circuit sound base is different from traditional Marantz 7, C22,  etc. It has the characteristics of fast speed, large dynamic, medium frequency density and charming charm. .

PCB size:  155*177*1.6MM  FR4  

Works voltage:  0-220V AC  >=20mA,     AC3.15V -0- AC3.15V  >=3A

This is a bare PCB.  we can provide the PDF schematic and BOM.