The 6l6 is an old GE and sounds very good. I tied pin 1 to pin 8 as it would be in most beam tetrodes. I guess it is not much difference connecting it to ground. Just a little longer wire. Perhaps I will try that. Seems a pretty clean solution.
I am using an old 5y3 that gives about 400v so I would hate to try one of the current production tubes.
I have several EL34s that are associated with a couple of Stereo 70s and have so far only used a RCA which sounds a little harsh compared to the 6l6.
I am tending toward old tubes as there are some bargains out there if you shop carefully.