Siegfried Breyer's book refers to a new type of 37mm anti-aircraft gun of which the H class was supposed to have 4 in 2 twin mounts. I think that's supposed to be them. The torpedo tubes are probably a leftover from a mistake. The H class were to have 6 torpedo tubes, 3 on each side, but they were fixed underwater tubes on either side of the bow (I know, that worked so well for Lutzow at Jutland). They must have finished the molds before realizing their mistake.