Location of DB WDs in the T_eff − log g diagram (Kepler et al. 2019), marked with small black circles. Also depicted is the location of the published DBV stars (gray circles), according to the compilation by Córsico et al. (2019a) and including also the newly discovered DBV stars by Duan et al. (2021) and Vanderbosch et al. (2022). The target stars of the present paper are highlighted with red circles corresponding to three already known DBVs, and with blue circles associated with the two new DBVs observed with TESS and reported here for the first time. The DB WD evolutionary tracks of Althaus et al. (2009) are displayed with different colors according to the stellar-mass values (in solar units). The blue-dashed line represents the theoretical dipole (ℓ = 1) blue edge of the DBV instability strip, according to Córsico et al. (2009).