Don't worry, it is all cool

It is always the vibe that comes first, the sounds will be different anyways, depend on who is playing, what guitar is used, the amp.
Other factors that I have no control over really

To me an old ac-30 is slightly middy glassy with some funny wool in certain frequencies, it is all mixed up in a funny compressed way.
They do not have the same sound as Marshalls or Hiwatts, much softer amps, more nose and less defined, but still with that British vibe.
So I never worry too much about accurate sound, more about getting that funny feel those amps gives...eventhough it is kinda hard doing it that from a small bla...er red box

But it seems to be working, even our Rivera R55(which I hate like the plague) got that Vox vibe, and a KT-66 equipped amp behaved in the same manner, so something is working