Re: Vox AC30 with Vintage 30's
Vintage 30's come in a lot of boutique EL-84 combos, so it's not uncommon.
What it does is lend a more Marshally midrange and tight lows. You lose a bit of the chimey high end you'd get from Alnico Blues. A lot of AC-30's come with Greenbacks, so V30's are like a beefier step up from that sound.
If you like to overdrive an AC-30, you'll appreciate Vintage 30's. If you're looking for the traditional Beatles, Petty, U2 chimey clean tone, you're better off with Alnico speakers.