The R390A was the best receiver of the tube era. In this photo we see four R390As with tape recorders, o-scopes (presumably to check for tuning/beat frequency for a data demodulation) and four teletype printers.
You can buy R390A's at hamfests, they are readily available! For example, check out my youtube series on repairing an old R390A.
(Thank you Ken Bird for providing the above photo.)