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anybody know what tube type comes in'a Vox AD30VT-XL?? the amp is almost new and the tube breakup is/was outta control as soon as you have sound..
the amp had ver little sustain at certin settings and cut in and out at anything over (5) as you turned the gain up.. I'd like to know what tube comes stock in the amp as the one i took out of it was Russian..
I replaced it with'a 60s Silvertone 12AX7 (sweet) 
Now shes pretty clean up to about 3 or so strats breaking up nicely at around 5 or 6 and would thrill any metal head at 8 and up.. when i went to swap the tubes it was obvious someone had opened the cab before the amp came to me.. is this kinda breakup pretty standard fare with Russian tubes? are they typically pretty good tubes? any help would be greatly appreciated......................laters,chuck 