gotten hopelessly addicted to the machine. first thing i started to do was explore tubes, if only for back up should catastrophe strike. i think i'm finally calmed down, but still wondering whether there is a better 12B4A than the JAN GE that the Good Doctor is shipping now? only one of the 'net dealers identifies their 12B4A stock as JAN GE, so there is a source that doesn't deplete the Doctor's stock. if it really doesn't matter, i'll just get a couple of them call it a day.