The Ampeg Superjet SJ-12T is a good little 1x12 tube amp. It has a wonderful built-in tremolo. It's a small but powerful 50 watt amp, and it looks awesome!
The sound is very clean and it requires a pedal in front before it begins to overdrive. Even when using an OD pedal, quite high volume is required before the amp starts to open up. The valve tremolo sounds wonderful and warm, it is a really nice feature on this amp. The reverb is better than in many other small amps - really nice but gets chaotic at higher settings.
The dynamic tone that you find in a good Fender wasn't there in this amp. Since I got it used, it could have been the tubes - I never bothered changing them, because somebody wanted to buy the amp, so I sold it.
I found this amp a little too clean-sounding for my taste. It has a nice tone, but I prefer amps that "open up" a little easier. I never tried it with a different speaker. I do think a speaker upgrade would improve this little amp a lot.
If you find one of these used to a good price, I recommend you change the tubes, and I would also recommend a better speaker, maybe an Eminence Tonker or Wizard?
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