There were two solder points on the back side of that circuit board that lined up with the center of each tube socket. I’ve built tube amps before. There are no connections in the center of a tube socket. Those look like connections for an LED. Just an observation
You should have read the description, if an amp says HiFi, hybrid, solid state amp. Look for point to point wiring Vacuum tube Amp. A real tube amp have vacuum tubes that glow a reddish color when warmed x
The amp is solid state. However, the tubes distort (buffer) the input signal, influencing the sound sent to the power amp, and then to your speakers/headphones. How do I know this without pulling the unit apart? By rolling the tubes. If the tubes were just for show, then why would the sound signature change when exchanging the original Chinese tubes for some Russian ones? It isn't a pure Tube amplifier but to say that the tubes are just lit up for show (and thus having no effect on the sound) is preposterous. Do a blinded test and you'll know clearly if the tubes have any effect on the sound that the amp pushes out. It'll save you the time and trouble caused when you start pulling the innards apart.
Las válvulas para funcionar necesitan de 100 a 150 voltios para funcionar en el ánodo. La fuente de alimentación de ese amplificador solo tiene voltajes de 17 voltios para la potencia del amplificador y 6.8 para los filamentos de las válvulas. Eso quiere decir que las válvulas no hacen nada, son adornos. Estafa.
