i saw little bit of information about yak-9ut with ns-37 and 45 (saw and before, but now another info, also not detailed), but all this so briefly and questionable, what, maybe, in book of Gordon and in these some sources had error, because i repeat all other good sources say about only n-37...

plus foto of yak-9ut (or?) with muzzle brake, but n-37 has MB too, if i'm not wrong...

and if was test with ns-37 which used from 43, in this case, why "танковый" yak-9ut was produced with 23 mm gun? (of course, for example, first prototype could be with n-37, next, especially, after 9 may with other guns like ns-37 etc, but don't think so)...

it's can be yak-9u or P with another weapon... yak-3t... maybe, if "ns-37", means lightweight gun=n-37... etc etc etc...

so, my opinion, as before, n-37 with 30 shells for prototype it's more realistic...

for serial yak-9ut, correctly could be only 23+2x20, no questions here...

this is very important info for all who want know more, just need to know types of serial numbers of each plants, good what we see this on english...