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Russian planes usualy didn´t have intercoms, only this system with tubes where one could sent mesages in paper.
As far I know system did work well for sending small cicarettes to another crew member.
System worked with air/vacuum so only small and light could be sent.
no, the SB was the only bomber which featured this unique tube system, all other soviet bombers like Pe-2, Er-2 etc had intercomRussian planes usualy didn´t have intercoms, only this system with tubes where one could sent mesages in paper.
Excellent! Never knew that a vacuum based system was installed in a WWII airplane. Wouldn't it have been cheaper to just string the wire and amplifier (tubes are big, hot and suck up lots of power) or use the old navy version of just sound tubes. Seems overly complicated for the Russians and their austere designs.