Vacuum tube radio receiver '' VV-663 ''.

Tube radios.DomesticSince the beginning of 1952, the Punane-RET "VV-663" network tube radio receiver has been produced by the Tallinn radio factory Punane-RET, Estonian SSR. The VV-663 receiver is based on the VV-662 model. The external design of the model remains the same. The HF part was slightly improved, the 6F6S lamp was replaced by the 6P6S. Adjusted ranges for LW and MW. HF sub-bands began to correspond to 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 VV-663M model, and later VV-663-2. In particular, a new dynamic loudspeaker "DM-II" was used, with a permanent magnet with a power of 3 W, instead of "DE-I" and some changes were made to the electrical circuit, which had little effect on the technical parameters of the receiver.