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The description is given for the speckle interferometer of the BTA 6-mtelescope of the SAO RAS based on a new detector with an electronmultiplication CCD. The main components of the instrument are microscopeobjectives, interference filters and atmospheric dispersion correction prisms.The PhotonMAX-512B CCD camera using a back-illuminated CCD97 allows up to 20speckle images (with 512$\times$512 pix resolution) per second storage on thehard drive. Due to high quantum efficiency (93% in the maximum at 550 nm), andhigh transmission of its optical elements, the new camera can be used fordiffraction-limited (0.02$''$) image reconstruction of $15^{m}$ stars undergood seeing conditions. The main advantages of the new system over the previousgeneration BTA speckle interferometer are examined.

The EMCCD-Based Speckle Interferometer of the BTA 6-m Telescope: Description and First Results