I have a monography about the Pike class submarines (in Russian) that describe the Drakon as the ASDIC copy.
Another monography I have (about the project 7 class destroyers) also states that Drakon was actually leand-leased British ASDIC. Also this monography says that several sonars of German origin were bought just prior the war and installed on some 7s but there is no exact information about the perfomance of these sonars in Red Navy.
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