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Since the beginning of 1952, the Punane-RET "VV-663" tube-based network radio has been producing the Tallinn Radio Plant Punane-RET, Estonian SSR. The receiver '' VV-663 '' is based on the model '' VV-662 ''. The appearance of the model remains the same. The HF part was slightly improved, the 6F6S lamp was replaced by the 6P6S. Adjusted ranges of DV and ST. HF sub-bands began to comply with GOST - 1951: KV-1 3.95..7 MHz, KV-2 7..12.1 MHz. In the summer of 1952, changes were made to the receiver, after which it became known as the model '' VV-663M '', and later '' VV-663-2 ''. In particular, a new "DM-II" dynamic loudspeaker was used, with a permanent magnet with a power of 3 W, instead of "DE-I" and also some changes were made to the electrical circuit, having little effect on the technical parameters of the receiver.