Has anybody seen this: http://www.vacuumtubes.com/6BG6.html These are apparently tubes manufactured by Philips, that have the same components as the 7581A. From searching online, it would appear that the plates are even the higher dissipation plates, and philips did it to save money. They sell for a whopping 6.00 each, which if they sound like a Philips 6l6GC then this is a GODSEND. Looking at the pictures online you have to admit, they even look like the same NOS tube, other than the plate cap. You put this adapter thingy in your socket that puts the plate voltage to the cap. The adapter is 5.00. The NOS Philips 6l6GC/7581 is about 90.00 per pair. Somebody slap me please, I need to know if this pipe dream is really a nightmare.