B22 (reference Beta 22 β22 circuit) HI-END reference level amp kit
Special Note:
This kit is not equipped with input tubes, please bring your own;
At the same time, the kit price dropped from 148 yuan to 108 yuan
Reference input pair tube model:
K170J74 (BL file), K364J104 (BL file), K366J107 (BL file) K246J103 (BL file needs to be reversed)