As for Magnit, this was taken directly from a radio recording that was made in 1986, when Korneev was still in the band.

Here is the rarest Soviet 7-inch hard rock/heavy metal single (only 2000 copies were released, and I've only ever seen one for sale): https://www.discogs.com/release/9755578-%D0%90%D0%BD%D0%B0%D1%82%D0%BE%D0%BB%D0%B8%D0%B9-%D0%90%D0%BB%D1%91%D1%88%D0%B8%D0%BD-%D0%9F%D0%BE%D0%BC%D0%BD%D0%B8-%D0%9A%D1...