Hi,
I fortunately had ordered a JJ 12AT7 and running it with that, it seems to be a little more stable although I am having a couple of other problems:
When turning the amp on too quickly after I turn it off, the fuse blows, I currently have a 3.15amp antisurge fuse in there, and it has gone through at least 3 of them and it seems to do the same if I turn it on too soon after being plugged into the wall.
Secondly, after playing the head for about 1hr+ at about one third volume on the gain channels, it starts cutting out then cutting back in. It seems to be an overheat circuit of some sort cutting in but I don't think it should be coming in so soon when I'm not making it work particularly hard? The cab running on it is a 4.6ohm cab, so I don't think I'm putting to heavy a load on it, my G2 100w could handle it no problem.
I am UK based, so I don't know if the mains there makes any difference to the operation of the head.
I've had a look inside the head and I can't see or smell any burned out components, still smells like new!
Could you please advise?
Cheers,
Dan