Specification Brand : FLYINSKY BulletPoint1 : ✅Tested DAC board, include the 6N11 and 6Z4 tube. BulletPoint2 : ✅R2R architecture AD1865 NOS tube version DAC (can support 24-bit input), using all positive power supply, CS8412 receiving, AD1865, passive iV single-ended 6N11(6922) output, 6z4 rectifier buffer. BulletPoint3 : ✅Compared with other non-R2R decoders, the 18-bit AD1865 of the R2R decoding chip has deeper bass dive, more bass overtones, and the sound does not float. BulletPoint4 : ✅NOS has stronger jitter immunity than oversampling and is less affected by time base jitter error distortion. BulletPoint5 : ✅NOS non-oversampling decoding is more realistic and more flexible than most decoders with digital filters, while general oversampling decoding uses digital filters It is easy to appear the sound beam spread and cause the playback sound to spread unreal. BulletPoint6 : ✅The tube output makes the frequency response more balanced, the sound density is high, and the analogue taste is further enhanced. Color : Grey ConnectorGender : Male-to-Female ConnectorType : Coaxial FinishType : Chrome IncludedComponents : DAC board, 6N11 Tube, 6Z4 Tube IndoorOutdoorUsage1 : outdoor IndoorOutdoorUsage2 : indoor InterfaceType : Coaxial ItemName : FLYINSKY High End Audiophile R2R DAC Audio Converter HiFi Architecture Decoder AD1865 NOS Tube DAC Board Audio Digital-Analog Converters Board with 6N11 + 6Z4 Tubes ItemPackageDimensions_Height : 3 centimeters ItemPackageDimensions_Length : 13 centimeters ItemPackageDimensions_Width : 9 centimeters ItemPackageQuantity : 1 ItemShape : Round ItemTypeKeyword : digital-to-analog-converters Manufacturer : FLYINSKY Material : Copper ModelNumber : E25511191UHA31MKM9EOJ NumberOfChannels : 2 NumberOfItems : 1 NumberOfPorts : 1 PartNumber : R2R-AD1868R-DACB ProductDescription : Works Voltage: AC170V 50mA×1 AC9V 500mA×3 AC6.3V 1.6A×1 (We have the power transformer available. If you need, we can custom-make it for you.) Use Tube: 6N11 and 6Z4 Input: COAX Output: Stereo L and R PCB Size: 138mm*120mm Thickness 1.6mm With tubes the max height about 80mm (include the Copper pillar height) Package include: DAC board×1 6N11 Tube× 1 6Z4 Tube×1 (Note: This PCB is no schematic available. )