It really has nothing to do with nostalgia. It's all about tone, and as much anyone tries, you will never achieve the sound & "feel" of a quality tube amp with solid state.
The big reason we wandered away from tubes in the 80's was due to tube shortages. The US stopped making tubes, and we had a hard time getting good ones in from China or Russia. Sovtek out of Russia, along with various US & Asian producers are now making high quality tubes in huge quantities.
