2 x 6as7 -> u=?

[jeapel]

hi
I would like to know:

6as7 -> pa max=13 watt with a low u=2

if i put 2 x 6as7 together pa max will be 26 watt but

u stay 2 or go up to 4 ?

thanks

[smoking-amp]

For 2 in parallel, the Mu stays the same at 2.

[jeapel]

thanks smoking-amp