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The prefix to the TV "UFT" was produced presumably since 1953 by several factories of the country. The prefix is "‹"‹designed to increase the sensitivity of TVs. The prefix was produced in three versions, for 1, 2 and 3 channels, respectively, was named as "UPT-1", "UPT-2" and "UPT-3". The design and layout of the Varian prefix is "‹"‹the same, the difference is only in the contours. The prefix was connected to the TV by the filament of 6.3 volts and by the anode of 250 volts and respectively between the antenna and the TV. More information about the prefix below.