T531 oscilloscope

The oscilloscope is a device used to visualise the changes of various electric signals in time. This type of vacuum tube oscilloscope was produced since the 1940s by the Křižík company in Děčín. A newer type was soon introduced, which was equipped with an input voltmeter. These oscilloscopes turned out to be very reliable and popular and were a common sight in electronics workshops until the 1980s despite their aged design.