Thankyou for your reply.
The tube is the 211/CV620 Shuguang, the amp is or will be a SET Pararell(SEP) class A Triode, two 211 for around 40W, Bias is manual, heating is DC(I wish), maybe a toggle swith to UltraLinear. Electrical mains feed is 220V (205/213V in real life)
Not sure how much Voltage this tube use to output 20W each, power supply in over 1K, I was think a Jolida JD3000A (that is UltraLinear) clone,
but I want Triode, class A, UltraLinear option is not fundamental.
Thanks, Gustavo