It's a Fargen Blackbird 30 head I got in a trade. It was built last Sept. and has all the latest appointments including Mercury Transformers. I had my amp tech go over it thoroughly, retube it and bias it. Now I notice that if I turn on the power and leave it in standby mode for just a few minutes, then turn the standby switch on, it isn't as loud as it should be. When I turn on the power and leave it on standby for at least 10 minutes, it sounds great when I flick the stanby switch - full powered and the right volume level. One more thing - this amp is SS rectified, and I figure there is some circuit that won't let it come on full blast right away, but still - it seems like it takes a really long time to get where it needs to be. Anyone with similar experiences with this amp or other amps like it?