I'm going by memory, but I think the 7044 was warmer sounding compared to the 5687 and 6900. I may have even tried different cathode follower tubes and the 6080. I would have to check my tube stash to confirm. You can always just send me a PM and I will look.
Do you know what 5687 is in there now?
Do you know what 5687 is in there now?