Hi. I don't know which tube-amp to buy? I play the blues and rock. I have an amp, and it's Fender Frontman 212r, which is really great, but I am collecting money for something more serious. I play the Stratocaster. I decided to by fender, and it will be combo amp. I really don't know what are the differences between twin reverb, super reverb, vibrasonic, blues deluxe, ... I prefer the tone with more bass, (like SRV, John Mayer). I hope you will tell me the differences between these amps, and what would be the best option for me. Thank you, and happy holidays!