Honestly anything can change sound, 2 of the same models can sound different.
Transistors vs tubes good and bad of each.
I’ve heard worse new transistor amps then better, Heard better tube amps then worse.
Modern Solid State preamp low noise floor can sound great with tube power-amplifier vintage or new.
Why is Marantz 7t worth less then Marantz 7c tube. I have both, both sound great!
Sound signature is close if not the same. 7C takes it further in space, detail, imaging etc. Marantz 7t is damm good, some people upgrade the heck out of them get amazing sounding preamp. 7c bone stock sounds better before doing anything. Is it the tubes? The Caps? Both are made in the US under Saul Marantz and Sidney Smith. They made sure Marantz 7t sounded and performed like the 7c.
Is there better made stuff Sure! Tubes are here to stay. Why are records coming back? Film or etc. I do want to build a 300b amp someday, try those western-electric tubes.