Reverb found. Thanks Don, it worked of course.
There is this sweet alchemy one can conjure with that Beta reverb (I don't know if this goes for other Sunn heads, though I'd like to be informed if it does)...One needs only take the channel volume level down to zero, with the master still turned up, as well as the reverb...add distortion, and this distant, almost delayed magic kind of emits like gas from the speakers. It sounds glacial. It sounds like the sun(n) sighing as it melts us into another age.
Thanks for the help.