The AI summary is unsurprisingly incorrect. The OTO (Level One) is a push-pull amplifier utilizing the 6005 power tube. The OTO SE and SE Signature/Silver Signature (Level Two) utilizes the EL84 power tube.
@regaflush917 The SORO is a fine amplifer…6L6 or 5881 power tube, more power than the OTO SE Signature, same chassis and features. I just happen to prefer the EL84 tonally, YMMV. Since you have a small room, either amp will be lovely. I preefer the Leben cs300xs to the base/push-pull OTO due to wider availability of the EL84 tubes in addition to 12ax7’s for the small tube in the Leben. The OTO single ended (SE) versions share the tube compliment of the 300xs.
I like to describe these two amps as the Leben cs300xs as that amazing girl from college that you date and the OTO SE Signature as that amazing woman you marry. One is just plain fun, one is the total package but it should be as retail pricing sortof says it all: Leben at $5k-ish, OTO SE Sig $8k-ish.

