Air Tight ATM-300R or Shindo Cortese 300B

@dinho The ATM-300R has less of what is considered the classic 300B sound than the Shindo. The midrange-centric, lucid beauty that characterizes many other 300B single-ended amps isn’t really where the Air Tight amp is at. It certainly still has a full measure of the single-ended-triode clarity and beauty, it is quite transparent and broadband.  So it really depends what sonic attributes you're looking for.

@antigrunge What other 300b’s did you consider before deciding on the Wavac and what’s the speaker pairing?

That's interesting that many prefer the Shindo F2A over the 300b version of the Cortese.  I rarely see a 300b version come on the used market but more often see the F2A's so I presumed perhaps the preference was opposite.  I know the F2A has had 3 design iterations over the last 10 years or so.  I'm not sure I've seen many of the newest iteration come on the used market and it certainly is the version that interests me most.  

Perhaps slightly off topic and maybe I need to start a different thread but let me pose a quick question on the F2A.   Originally the Cortese F2a was a single 6aw8a tube per F2a tube, and went through an evolutionary change years  later to dual tubes per f2a tube and a few circuit updates. The current model, uses a tube rectifier on top of the chassis and different input/driver tubes altogether and was designed by Takashi Shindo.

Can anyone provide listening impressions between the current and immediately prior version of the F2A amp?  Shindo moved the retail price up by $2,500 during the last version.