Fusion 550 or MB800?

[Roger Johnson]

Looking to replace my 1001RB II with a tube preamp type. I have been considering the Fusion 550 or the MB800. I don't perform professionally, and only do informal jam sessions. I have a Ampeg 610HLF bottom. Opinions on which is better?

 

[B-string]

Same basic preamp in both Fusion 550 and MBF800. The Fusion 550 uses the 1001RB's power amp, run a little different for 504 watts at 4 ohms with 836 watts sustained burst. The MBFusion 800 is a class D with lightweight SMPS, does over 800 watts at 4 ohms and sustained burst over 1,000. Either one could drive your 610 into the next city. Did you want more info on the non-tube MB800?

 

[Muttleybass]

I did a side by side at a music store and couldn't really tell a difference in sound. That MB Fusion 800 is a sweet little amp.

Not sure I have any use for the motorized knobs of the 550.

Personally, I would go for the MB F 800, just for size and convenience.

 

[Roger Johnson]

I didn't realize they were the same pre amp. If the only difference is the chassis and the solid state amp I may lean toward the MB Fusion 800. I was unaware that there was a MB800 solid state version, so thanks for the clarification.
Now I just need to decide if I should sell my MTD 535...

 

[B-string]

Fusion 550 1001RB power amp, motorized knobs for a second "channel" and line frequency power supply, horn amp (you won't use with your cab) about 27 lbs.
MB Fusion 800 some different switching features over the MB Fusion 500 or Fusion 550. Class D power amp, Switch Mode Power Supply (SMPS) about 5 lbs. MBF800 is the newest in the family, there are all SS MB800 and MB500s as well.
Full tube preamp, easily 800 watts and 5 lbs. How can you go wrong .