However due to the 76.2mm L-11 gun was too complicated to produce and not very powerful into the combat it was replaced by the 76.2mm F-32 and a third machine-gun was added on the hull thus becoming the KV-1 m1940, a variant of the model 1941 called KV-1e model 1940 was equipped with additionnal armor plates, a new cast turret and the more performant 76.2mm F-32 gun. After a trial during the Winter War, show its superiority on the SMK and T-100, the KV was official baptized KV-1 and enter active service December 19, 1939, eliminating its concurrence. The KV prototype, unlike its concurrents, was equipped with a diesel engine and a 76.2mm L-11 gun and was sent to Moscow on Septemand presented to the Soviet government on the 25th, it was then resent to Leningrad on October 8 for several tests. This reduced the length of the machine (by two support rollers), which had a positive effect on the dynamic characteristics. And only as an experiment, we also developed a smaller version of the QMS - with a single tower.
The new tanks created under this concept (SMK and T-100) were two-turreted, armed with 76 mm and 45 mm guns. However, the designers did not decide to abandon the use of several towers: it was believed that one gun would fight with the infantry and suppress firing points, and the second must be anti-tank-to fight with armored vehicles. In the late 1930s, attempts were made to develop a tank of reduced size (compared to the T-35), but with thicker armor. And the huge size of the tank only makes it heavier and unmasks it and does not allow you to use thick enough armor. It was obvious that the presence of a large number of towers, although it is an advantage in firepower, but inevitably entails side effects in the form of complexity of the design and as a result, its increase in cost, speed of manufacture and less reliability. In fact, the tank began to be designed at the end of 1938, when it became finally clear that the concept of a multi-turret heavy tank, like the T-35, is a dead end.
There was a misconception that the tank was created during the Finnish campaign to break through the Finnish long-term fortifications (the Mannerheim line). Such modern fortified lines as, for example, the Maginot line or the Siegfried line were considered even theoretically insurmountable. Most of the armies of the developed countries of the world had their own theories and practices for overcoming powerful fortified positions of the enemy, experience in this was acquired during the First World War. According to Soviet military theory, such tanks were necessary for breaking the enemy's front and organizing a breakthrough or overcoming fortified areas. B mit 10.The need to create a heavy tank carrying anti-tank armor was well understood in the USSR.
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