Viktor Zinger shared the backup goaltending duties with Alexander Sidelnikov. Neither played as the young Vladislav Tretiak emerged as the ultimate Soviet netminder.
It is unclear as to which goalie dressed as the backup goalie for each game. Such information is very hard to uncover. One source "vaguely" remembered Zinger backing up Tretiak in all games in Canada and Sidelnikov doing the duties while in Moscow, but we can not confirm that.
Of the three netminders, Zinger was definitely the elder statesman. His career ended shortly after the 1972 Summit Series.
Unearthing information about which backup goalie dressed for which game has proven difficult. It appears that Zinger dressed as the back up strictly in the 4 games in Canada, although are unable to confirm that.