This paper describes the transistorized linear counting ratemeter which can be uses to indicate on the meter or record the counting rates of the nuclear radiations produced from the atomic reactor or from the radio isotopes. Tte feature of this ratemeter is the use of the transistor chopper for good stabilization. At the input stage of the a. c. amplifier a composite emitter follower buffer stage has been used to give the high input impedance. A hybrid parameter equivalent circuit was modeled for the analysis of this buffer stage. The counting rates can be linearly measured from few CPS up to 100KCPS in 4 ranges. The resolution is less than 0.5$mu$sec and the output drift at the room temperature with 7-hour continuous operation is in the order of $pm$0.5$mu$A.