There might be a CRT with a DVI interface, but it would be utterly pointless as CRTs require an anolog signal, meaning that the digital signal would have to be converted to an anolog one anyway.
Only benefit I can see would be the reliability of transmission, i.e. DVI is less sensitive to interference.
CRTs that have DVI input do not take a digital signal. The DVI connector has four pins to carry an analog signal, which CRTs will use if connected via DVI.