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The semiconductor voltage stabilizer "SPN-400" has been manufactured since the beginning of 1971 by the Saransk Electrovypryamitel plant. Designed to power TVs and other equipment with power consumption up to 400 watts. This is the first domestic voltage stabilizer on semiconductor devices. The stabilizer operates on AC mains with a frequency of 50 Hz and 127 and 220 volts. The rated output stabilized voltage is 220 V, the efficiency is 90%. When the mains voltage changes from 95 to 146 V (for 127 V network) and from 156 to 253 V (for 220 V network), the stabilized output voltage does not exceed 198 ... 231 volts. SOI of output voltage is not more than 12%, with SOI of input voltage no more than 3%. The dimensions of the stabilizer - 262x127x138 mm, weight 5.5 kg. During production, which is more than 15 years, the stabilizer was improved according to the scheme, its design changed.