I built a test mono block and was going to use a UL PP OT with EL84s, but I don't have a UL OT that's small enough to fit this chassis and I already have a pair of 9 pin output tube sockets fitted. Is there another 9 pin output tube that I can use that doesn't need a UL transformer? I have a decent selection of TV/Radio tubes to pick from and thought about using the 6AQ5 but that's a 7 pin and my socket holes are too big for those. No room on the box to put 8 pin octals either, so I'm in a bit of a quandry.
Thoughts?