It has been broken for over a year now so my memory may be a little hazy...OT, what is wrong with your LB? I own one as well, so just curious.
It started being noisy, I didn't think much of it since the power in my apartment suck and there is always a little bit of noise in my setup but it got worse over the course of a few months. Then one day I plugged in and no sound came out. But every time I plucked a note the VU meter would redline. As far as I remember I always played it with a cabinet hooked up but sometimes my cable does cut out so maybe that had something to do with this. I really don't know.
My other amp is a Walkabout so I am still very happy with my amp setup but there really was some magic in the tubes of the LB30 and I really really want to hear it with my Subway 1x15. And maybe get the amp tech to install something lower gain than the stock 12ax7/ECC83 and try an 12at7 because I have my dirt needs covered really well with pedals and like my amps a little cleaner.