  T CrB is a symbiotic star that experiences nova outbursts every $\sim$ 80~yr.
The next, long-anticipated nova outburst should occur during the 2024-2026
period. Here, we present results of high-resolution optical spectroscopy of T
CrB in the period 2016 - 2023. In these spectra, we measured the equivalent
widths of the H$\alpha$, H$\beta$, HeI and HeII emission lines. The maximum
equivalent width (EW) was recorded on May 2021, when the EW of $H\alpha$
reached -44.6 \AA and H$\beta$ = -21.5 \AA. At the other extreme, the minimum
of EW($H\alpha$)= -2.9 \AA was recorded in October 2023. After October 2023,
the B-band emission brightened, suggesting a re-appearance of the orbital
modulation. In addition to the optical data, we study the X-ray behaviour in
the same period. We find a strong correlation between $EW(H\alpha)$ and X-ray
flux with a correlation coefficient -0.78 and a significance of 2.6$\times
10^{-5}$.
