I recently bought a used ac30 tbx (british made w.computer wired board), i believe from 2000. It was in great shape and looks beautiful... after using it a couple times the standby light began to turn off while it was on and then the amp would fail to make a sound again. Brought it to a tech out here, he replaced a number of tubes including the gz34, checked out the fuses and transformers, and found nothing. He figured it could be the standby switch, so he replaced it with one that was soldered on, and it failed to fix the problem. He is not a Vox man, but said it is probably a random intermittent part that he would be unable to locate with out complete knowledge of the model. The amp will work on occasion, but then after a while the standby light will turn off and it will fail to work again for a long period. It's driving me insane, and i can't seem to find anyone in my area (Boston) that has enough Vox knowledge and is willing to tackle this. If anyone has any suggestions - technical or otherwise - i would greatly appreciate it.