Thanks magneto sound, i read the data sheet of both tubes....6386 had 4250 ohms plate resistance, so 10k plate resistor is fine i think, But 6BA6 had 0.25 Mohm (as pentode)...i don't know how to define the Ra, Disa limiter use 6k8 Ra and 300ohm cathode trim. But i'll try with 10k and 240 ohm, thanks for the pic. I plan to get LL1660 for the interstage (the only iron i can get locally and i'ts very expensive), but for now i used Ptx with 4:1 turns ratio ( :-[). I can't get rid of thump when using coupling cap (no matching tubes), and i really like the sound of using "interstage Tx". Everything is ok except hum in one bottle ( only heard when i crank the monitor level up). I swap the bottle and it's stay in that particular bottle . I'll get another one this week.
Many thanks MagnetoSound...