After operating perfectly for over a year, my VTA ST-120 started repeatedly blowing a fuse within a minute or two of being turned on. I removed the cover and found a blown 12AU7 (white top, cracked glass) in the V1 socket on the driver board. I've ordered a new tube which should arrive in a few days. My concern, however, is whether the bad tube caused the fuse to blow, or whether there is another problem that caused both the fuse to blow and the 12AU7 to fail. I don't want to stick in a new 12AU7 if something else is going on that I need to fix first. Any help would be appreciated.
Charles
Charles