I know better than to ever run an SVT with out it plugged into the cab. So here is what happened...I plug in my Peavey Fury Pbass for some bedroom jamming. Running an 89' SVT-II non-pro through an 810E. Wanted to set some levels on a pedal. Well...no sound. So I freak out, and check a lot of things. Not thinking I through it on standby, and unplugged it from the back of the speaker to check the connection. Well...this is funny...turns out my volume was all the way down on my bass. Anyway, I have heard and read many stories about the SVT frying tubes and output transformers when running without a cab connection. So far, so good its running. Just hoping I didn't create any problems that could linger in the future.