The product is for DIY kit. all the parts will need youself to solder it, We have assembled board with the ASIN# B078JLBH1N
Designed with dual independent design, physical left and right channels 100% separation, independent grading ground.
Preamp board Works voltage: +DC280V (above 10ma ) X 2 groups and + DC12.6V ( above 0.8A)
Power supply board input voltage: 0-AC220V X 2 (200V-240V are ok)
0-AC12V X 1 (12-15V are ok)
Preamp PCB Size: 154*77*1.6MM
PSU PCB Size: 130*70*1.6MM
Taiwan metal film resistance 1% accuracy
MKP coupling capacitor
Ceramic tube socket.
This board can using 3pcs 12AX7 or some other same type tubes (12AXX series are all ok).
if you want change using Filament voltage 6.3V tubes. such as 6N11/6N2.... can adjust the power supply board lower voltage to 6.3V. and the input Low AC voltage 6V-9V are ok.
Package: 1 pc DIY KIT PRT-07A Hifi Tube preamplifier (no tube) + Power supply kit base on M7