so the options for the new woo amp
1) plate resistors, they already said its not this
2) inductors, they already said its not this
3) center tapped inductor, you get about 6db of gain with this.
3a) push pull output transformer. all sorts of issues with gain and power with this
4) solid state current source
maximum voltage gain of 6sn7 is about 20, maximum voltage gain of 300b is less than 4
somewhere there are likely to be input/interstage transformers and then you are still going to have trouble getting to a voltage gain of 500 or more if you want some feedback to reduce the distortion.
the viva evidently is also low on gain, and uses and output transformer.
why people produce shit like this I do not know