This paper describes a system which can photographically record with one dual‐beam oscilloscope the amplitudes of 10 simultaneous photomultiplier pulses over a four‐decade dynamic range with an accuracy of ±1.5% over the entire range. The signal processing time is 2.2 &mgr;sec. The basic circuit is a logarithmic pulse‐height‐to‐time converter with two triggering levels, requiring twelve transistors per input channel. The dynamic range of the device could be easily extended to six decades, and the two‐level technique can be applied to digitized recording systems and pulse height analyzers. The circuit has been found to meet the above specifications over a temperature range from −19 to +38°C.