Model 3d in Blender 2.91 Render Engine CYCLES.

Koliber MOT-601 - was presented in February 1961 at the 1st National Exhibition of Radio Components in Warsaw. It was produced at the Eltra Radio Works in Bydgoszcz and was an improved version of the Eltra receiver. The most important design difference was the use of the push-pull output amplifier. All transistors were imported.Koliber 2 MOT-611 - differed from its predecessor with the full range of long waves and the use of Polish transistors in a low frequency amplifier. More modern alloy diffusion transistors are used in the mixer and the intermediate frequency amplifier.Koliber 3 MOT-633 - differed from Koliber 2 with the use of Polish transistors in all stages of the receiver and the use of a cascode on two transistors in the first stage of the intermediate frequency amplifier. The receiver is equipped with a headphone socket and a socket for the clock adapter, enabling the receiver to be turned off.Around 1967, the Kolibry was replaced with the Sylwia receiver, which is a simplified (without a cascade stage) version of the Koliber 3, built on the same printed circuit board.The individual versions did not differ significantly in terms of operational and technical parameters. Hummingbirds came in different varieties and housing colors.