Re: Engl fireball 60 vs engl screamer 50
No clue on the fireball but I can fill you in on the screamer 50.
You have two channels with two modes, footswitchable reverb and A/B volume.
Clean- Fantastic. Its good enough to do country, surf, jazz or anything that requires a pristine sound. Can distort if you turn the drive over 12' o clock, otherwise it stays clean at high volumes.
Clean/hi gain (OD) - Crap. Worthless.
Distortion/low gain - Good solid distortion channel. Lots of mid crunch. Does well for most styles of rock depending on where you set the gain. It can go from classic rock to modern rock or alternative.
Distortion/high gain - Fuller in the lows and mids than the 3rd channel. Has more white noise but more balls and power. This channel sounds great for modern music, lead playing or metal.
Reverb - Natural and lush. Can go from subtle to excessive.
Effects loop - It works. Has a knob to mix wet and dry signal.
In summary, it is a versatility machine. It's perfect for my band, which will go from funk, country and jazz to metal and heavy rock. It has plenty of gain on tap. I can get a good metal sound without turning the gain above 12'o clock. Make sure you change the stock tubes though, it will make a huge difference. I recommend JJ 6L6s and sovtek LPS for the preamp. The only downside is lack of a good OD sound and the white noise can be excessive on the high gain channel.