Actually, the "Transistor Tibe" doesn't exist..... the picture is of a "Thermionic Valve" or, as refered to in the US, "Thermionic Valve".
Transistors and valves / tibes operated on totally different principles.
Transistors use doped Silicon layers to control electron flow, via appllied current bias, (transistor principle) where as valves / tubes use a single (or multiple) grid plates to interupt the electron flow between the heater and the anode(s).
Valve operate using (lethal) high voltages, and in some cases, emit X-Ray radaition (Klystron RF Gigawatt Valves), and transistors operate using lower, less harmfull voltages.
But the major difference is that Valves are used to amplify small currents where as Transistors are used to amplify small voltages.
Valve / Tube audio amplifiers give a cleaner sound than noisy solid state transistors..... I've fixed quite a few Valve / Tube guitar amps.
Alas, electronics engineers that still know how to dabble with Valves / Tubes are a dying breed, as the youngsters see just how many hundreds of DC volts are exposed within a accidental finger's reach and shy away.