VAREG voltage recorder

Volt- or amperemeter that recorded the value on a paper tape. These devices were extensively deployed in various industries to record the operation of assembly lines, power plants etc. An unusual purpose could be the measurement of mains voltage deviations in households. The vacuum-tube TV receivers of the era were sensitive to voltage deviations, which could be significant due to the poor state of electric transmission lines. By analysing the fluctuations of the voltage recorded on the tape, the TV repairman could select a suitable solution. In severe cases, a mains stabilizer would be necessary.