Very interesting topic if you (like me) want to see what's inside your E9, without opening it...
I have a question about the output of the E9. I was trying to calculate how much power it puts out into 50 Ohms, but I get different numbers from your specs.
1 W into 16 Ohms:
=0.32 W=320 mW
If I use 80 mW into 600 Ohms:
=0.96 W=960 mW
Is my math correct and am I using the right formulas? Why are the numbers so different and which one is closer to the real power output into 50 Ohms?
I don't understand what I need to do. Do you mean calculate for 1 W into 26 Ohms and 80 mW into 610 Ohms?
P=sqrt((1*26)^2)/50=0.26 W into 50 Ohms (woops, =0.52 W into 50, edited)
P=sqrt((.08*610)^2)/50=0.976 W into 50 Ohms
This is probably not what you meant, sorry.