In time-compression multiplex (t.c.m.) transmission, the signals of the channels are scanned and the samples are stored before being transmitted at high speed. A store that can be used in t.c.m. systems is described in the paper. Each channel sample is stored as charge on a capacitor. These capacitors are connected to common input and output leads through diode gates.A theoretical analysis is made of the operation of the store. It is shown that its frequency response is adversely affected by residual charges left by previous samples. These can be removed by using erase pulses. The theory was confirmed by experiments on a model store with 32 storage elements per channel. The leakage current of the diodes used was found to limit the noise performance of the store.