I have not tested this unit other than to turn it on and my observations include that it has a powerful hum and all the vacuum tubes appear to light up. I am selling all of my vintage amplifier and stereo equipment as for parts or repair regardless of their current condition because as we all know it is just a matter of time before these vintage units need just that. It will be packed in bubble wrap and packing peanuts in a stiff cardboard double box to maximize its chances during delivery. Please see photographs as they are part of the description. This unit is sold as is but my hunch is that it's ready to rock- the way it sounds when it powers on. Please also see my positive feedback and recent sale of a nice Bogen amp. Thanks for looking.