S1-65A (Oscillograf universal'nyj) 1981
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Universal oscilloscopes "C1-65" and "C1-65A" were produced from 1979 and 1981. Oscillograms are designed to study the shape of electrical signals by visual observation and measurement of their amplitude and temporal parameters in the shop, laboratory or field conditions. Oscilloscopes "C1-65" and "C1-65A" are similar in schematics and appearance, But the oscilloscope "C1-65A" has a working frequency of 50 MHz, as opposed to 35 MHz in an oscilloscope "C1-65", as well as a larger size screen CRT, while maintaining the dimensions of the case.
Information from collection of Valery Khartchenko