Just get old version PCB from HK good friend Really thx for his kindly help!
and 2SD400 vs 2SD1863, which one is better in sonic?
Could I supply by +-15V when I am using Class A? As I would like to make my 627 to work at the best performance voltage.. would it out of the 2SD400/2SD1863 linear region?
Thank all for help , I am too stupid