Radio receiver R-250 “Kit” is a Soviet short-wave radio receiver for long-distance communications, radio reconnaissance and direction finding, military and civil purposes, produced in various versions from 1949 to 1980.
The R-250M2 was produced from 1968 to 1980, and even later on special orders. Instead of metal lamps, finger lamps are used. The mass of the power supply has been reduced to 9 kg due to the abandonment of the ferroresonant stabilizer.
In the tropical export version, the receiver was called R-250M2T. For the USSR Navy, the receiver was produced under the designation R-670M. A rack-mount version with two R-250M2 receivers for diversity reception on radio lines was produced under the designation KMPU-M. It was manufactured at the Barnaul Radio Plant and was completed with receiver units of the Kharkov Proton plant.
Radio receiver R-250M2 1.5-25.5 MHz in 12 ranges, with optional extension kit four additional ranges up to 33.5 MHz, AM/SSB/CW.
In the upper block of the R-250M2 radio receiver there is a second intermediate frequency path, a low frequency path.
In the lower block of the R-250M2 radio receiver there is a high-frequency path and the first intermediate frequency.
The power supply unit of the radio receiver is located in a separate housing. It converts the alternating voltage of the mains into the voltages required to power the filament and anode circuits of the receiver (160 V anode voltage, at a current of 120 mA and ~ 6.3 V, at a current of 8 A).