[ben7799]

Many orders of magnitude so.

The last generations of vacuum tube processors were the size of large multi-story office buildings and had 50k tubes.

Compare to your smartphone, it would take billions of tubes to duplicate it.

[Thetawaves]

Later research into thermionic devices did produce miniaturized versions, but nothing close to the scale of silicon transistors today.

If the same R&D might went into thermionics, we might just have devices of similar scales.