I just finished and amp I had been working on for a while. It used a 6N6P triode based push pull output section. The 6N6P is the Russian version of the ECC99. The input is a 5725 pentode and uses a 6N2P gain stage and cathodyne PI. For a triode based output section I think it came out alright. I’m calling it the Blue Lizard for no particular reason other than I painted it blue.
Here are a couple clips:
More info and the schematic are here.