Details:

Sound features: dynamic sharp / low frequency with elasticity / sound field width / three fields are balanced. 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 Board PCB Size: 100 x150x1.6MM PSU Board PCB Size: 130x70x1.6MM 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.

Note：

Diy kit：all parts need buyer to solder， Assembled board：have tested well， Not included tubes ,PSU board and transformer !