Yes it sure seems that way.
Lets go through a few groups of tubes and give simple views
101d very linear least bass , most or of the most speed in notes and impact but has least note thickness. I think it's staging seems flat least musical but great on big stage like classical
next 242 seems to increase a relaxing feel / clean nice highs increased note thickness has good musicality has good Staging and overall a nice tube. Has good speed but not brutal like a 101d
px 25 that feels like a 300 b or heavy 45 but has low noise floor giving it more details even in bass than a 300b
45 a bit brighter less warm I have many so they vary but more note thickness thena 101 d
more tense then a 242
300 b has increased warmth and a bit bloated bass some have a lush mid but they seem to roll
off the highs more making some seem darker
now strictly bass
101d very detailed fast articulate
242 a bit more weight and still has speed but relaxed less analytical then the 101d
45 my sweet spot for bass has it all speed , weight , impact
then the px25 and 300b more impact , slower
more weighted and some seem bloated
now in my head dac I can roll In
driver tube that negates what's wrong with a 300 b
this is with a px25
the drivers are extremely neutral so it does work both as a dac and with headphones
please reply this nkt an argument it's just hiw each hear it on there system