The output stage uses 6DJ8 as the cathode output, the first stage voltage amplification uses 12AU7 common cathode amplification, and uses the FET constant current source as the first stage cathode constant current. The output of the board can be balanced or single-ended, and the input can be balanced or single-ended.


preamp PCB Size: 230mm×155mm*1.6mm




amp board works voltage:    260VDC       +      12.6VDC     +    6.3VDC


( 2 channel two 260VDC can share same one 260V. also can use two Independent 260VDC)



Preamp use tube:    2pcs 6DJ8    + 2pcs   12AU7    


Debugging: Adjust VR1  VR2  so that the voltage between pin 3 and pin 8 of tube V1  V3 about  6VDC.





Package include:    LS60 balanced Tube preamp bare PCB    X 1

                              

we can provide the PDF schematic by email.















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