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Pre-outburst signal (a decrease of the optical brightness) just before theoutburst is clearly detected in the observations of the T CrB obtained beforeand during the 1946 outburst. A similar decrease is also visible in the lightcurve of RS Oph during the 2021 outburst. We suppose that this is due toformation of a thick, dense envelope around the white dwarf, and we estimateits size (1000 - 2000 km), mass (5.10$^{-8}$ - 6.10$^{-7}$ M$_\odot$) andaverage density (5 - 16 g cm$^{-3}$).

Pre-outburst signal in the light curves of the recurrent novae RS Oph and T CrB