If you can invent and patent that idea, you may make a fortune on it. Weber sells a solid state tube rectifier emulator that is housed inside a tube-like metal housing and plugs into a tube rectifier socket ..I use one in my JTM50 clone (my only remaining tube amp). Works great, never a problem. Can't tell the difference between it and a GZ34. I bought it when my GZ34 failed ....18 years ago.
Weber and others sell octal, plug-in, solid state rectifiers, but that doesn't provide context for solid state signal tubes. The plug-in may have resistors for voltage drop, but other than that it's just diodes that can handle HV and it's super simple. You can make one yourself.
Replicating something like a 12xx7, 6V6GT, or 6L6GC is another matter. Coming up with solid state components that can take HV in a circuit that replicates a signal tube structure is difficult.
For collectors of the Zenith Trans Oceanic and similar radios, there's a cottage industry that's making solid state replacements for the 1L6, 50A1, 1R5, 1U4, 1U5, 1S5, 3V4, 0A2, and 0B2T miniature tubes. These radios operate with a maximum B+ of 90 Volts, so these tubes are more doable than trying to replace a 6V6GT that a Deluxe Reverb hammers with 450 Volts.
Last edited: