Article from warspot.ru. Author: Yuri Pasholok
Work on Soviet SPGs assigned at the plenum of the Artillery Committee held on April 14-15th reached their logical conclusion by the end of 1942. The light SPG concept turned into the SU-12, designed by factory #38’s design bureau and S.A. Ginzburg (the future SU-76). The most promising medium SPG was the U-35, designed at UZTM. By the end of December, the first vehicles of the pilot batch were complete.
The heavy SPG was in a more difficult situation. The project that started as the «212» bunker buster radically changed several times. The ZIK-20 SPG was to go into production, but the process dragged on. Even a model of the casemate was not completed on time, to say nothing of the SPG itself. In the end, another vehicle was developed, the KV-14.
An alternative from Chelyabinsk
After the story with the KV-7, the Chelyabinsk Kirov Factory (ChKZ) did not involve themselves in SPG development. The factory had enough to do with putting the T-34 and KV-1S into production. Nevertheless, regardless of who designed the prospective SPG, it was going to be produced at ChKZ.
ML-20 mount in the KV-14, December 1942
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