I have to admit
@Isaacc7 that I read with a lot of interest your findings about triode vs ultra linear. But while doing that I also realized I did not really understood correctly what ultra linear meant. From time to time we need to go to
Wikipedia.
And my confusion was related to pentode and ultra-linear, I was thinking these are the same thing. At least until you explained it
here. Now that I started to understand what you do, let us know more about triode vs ultra-linear and how you get along with it. This is something I cannot do but I consider it a point of interest.
Regarding my own rolling activities: Saturday was a point in time which makes me think it does not make sense to try new tube types. When I first put A2293 on the amplifier I was very impressed, a nice triode sounding somewhere in EL84 style with some british sweet mids, what to say, good sound. On Saturday when I put it 1:1 with EL50 I could not listen to it anymore. So, it was unexpected for me to be disappointed about something I was praising a few days ago. In short: I'll stick to my side contact pentode era and try to see what we can do in that range of tubes, next stop
EBC3 which is a double diode triode! Not many triodes on that family so I am really curious to see how it will perform.
Later edit: Interesting discussion
here. Now honestly I know not much about load lines and so on, but does it make a difference to evaluate triode/pentode/ultralinear on a headphone system or on some speakers? I have no clue and it would be nice to know if the findings on the Odyssey will be relevant on my use case with a headphone.