I love my Boss Katana 100 combo, but I miss having a tube amp. If I were to get one it would have to be portable, and no more than 500$. The only two amps I can think of off the top of my head would be the Fender Pro Jr, and the Vox AC10. I have read that the Pro Jr's have a problem with loud hissing noise that is very noticeable. I don't know if Fender has since fixed the problem as that would definitely deter me from purchasing this amp. What are you opinions of these amps? And are there any other amps I should look into, new or used would be fine. I play blues and rock mostly.